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Flushing Your Coolant on your BMW
 
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Pelican Technical Article:

Flushing Your Coolant on your BMW

Nick Czerula

Time:

1 hours1 hrs

Tab:

$60

Talent:

**

Tools:

Set of sockets (13mm could vary), 6mm Allen bit, Flathead and Phillips screwdrivers

Applicable Models:

BMW 325i Sedan (2006)
BMW 325xi Sedan/Wagon (2006)
BMW 328i Coupe/Conv (2007-13)
BMW 328i xDrive Coupe (2009-13)
BMW 328i xDrive Sedan (2009-11)
BMW 328i xDrive Wagon (2009-12)
BMW 328i/xi Sedan (2007-11)
BMW 328i/xi Wagon (2007-12)
BMW 328xi Coupe (2007-13)
BMW 330i/xi Sedan (2006)
BMW 335d/i/xi Sedan (2007-11)
BMW 335i xDrive Coupe (2009-13)
BMW 335i xDrive Sedan (2009-11)
BMW 335i/is Coupe/Conv (2007-13)
BMW 335xi Coupe (2007-13)

Parts Required:

Engine coolant

Hot Tip:

Work with a cool engine.

Performance Gain:

Cooling system parts lifespan increased.

Complementary Modification:

Inspect hoses

Draining and filling your cooling system is a maintenance requirement as well as being part of many repairs. Be careful when working with coolant. It is poisonous and especially dangerous for pets. Clean all spills immediately and rinse area with water. Engines used in BMW E90 automatic transmission models hold about 8.2 liters of coolant, manual transmission models hold 8.4 liters.

In this article, I'll go over the steps involved with replacing the engine coolant on the BMW E90 models. Be sure to work with a cool engine and confirm the cooling system lacks pressure before opening cooling system.

Lift and support front of vehicle safely. See our tech article on lifting your BMW E90.

Remove front engine splash shields. See our tech article on engine splash shields removing.

Draining cooling system:
Working in engine compartment, remove expansion tank cap.
Figure 1

Working in engine compartment, remove expansion tank cap. (green arrow) Be sure engine has cooled before removing cap. Cover cap with rag when opening, if there is still system pressure, this will lessen the spillage.

Working at bottom of radiator, remove radiator cover fasteners.
Figure 2

Working at bottom of radiator, remove radiator cover fasteners. (green arrows) Once fasteners are removed, the metal brackets will come off. Note the position of these brackets for easier reinstallation.

Then remove cover from vehicle by pushing it toward front of vehicle to unlock tabs that lock into subframe (green arrows), then pull down and remove from vehicle.
Figure 3

Then remove cover from vehicle by pushing it toward front of vehicle to unlock tabs that lock into subframe (green arrows), then pull down and remove from vehicle. Place a 5 gallon bucket under left side of radiator.

Remove radiator drain plug and drain coolant.
Figure 4

Remove radiator drain plug and drain coolant. (green arrow) Allow coolant to drain into bucket. Once coolant has stopped dripping, reinstall radiator drain plug.

Some E90 models have two radiator drain plugs, one on the left and one on the right side (green arrow).
Figure 5

Some E90 models have two radiator drain plugs, one on the left and one on the right side (green arrow). If you have two, remove the right side after you are done draining the left side.

Working at right side under vehicle, behind sway bar, locate back of thermostat.
Figure 6

Working at right side under vehicle, behind sway bar, locate back of thermostat. Then remove hose by loosening hose clamp (green arrow) and pulling hose off thermostat. Allow coolant to drain into bucket. Once coolant has stopped dripping, reinstall coolant hose. Be sure hose is installed correctly and replace hose clamp if there is any doubt it isn't in good condition.

Filling cooling system:
Using a 50% distilled water 50% engine coolant mix, slowly fill expansion tank (green arrow) until coolant level indicator reaches MAX.
Figure 7

Using a 50% distilled water 50% engine coolant mix, slowly fill expansion tank (green arrow) until coolant level indicator reaches MAX. The level indicator diagram is located on tank (yellow arrow), reference this when filling to obtain the correct level.

Working at top of coolant expansion tank, loosen coolant expansion tank bleeder screw (green arrow).
Figure 8

Working at top of coolant expansion tank, loosen coolant expansion tank bleeder screw (green arrow). Then fill expansion tank until coolant comes out of bleeder screw. Then install and tighten bleeder screw. Bleeding cooling system: Trapped air is common when filling a cooling system and can result in improper cooling. It is important to bleed your cooling system each time the cooling system is serviced. Install expansion tank cap and be sure all bleeder screws are tight. Turn ignition ON (do not start engine), set temperature controls in vehicle interior to full warm and blower fan speed to Low. Press accelerator pedal to floor and hold down for ten seconds. Electric coolant pump will run for about 12 minutes to circulate coolant and bleed air from cooling system Once pump has run the cycle, check level of coolant in expansion tank and adjust as needed. Start and run engine at idle until it reaches operating temperature and check cooling system for leaks.

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Comments and Suggestions:
greg Comments: I just replaced my radiator in my 08 328i. Everything seemed fine until a few days ago when the temperature gauge image came on for about 20 seconds and then went off. It has done it a few times. I also notice the radiator fan coming on and staying on. I am getting no continual message our trouble code. I replaced the thermostat about a year ago, do I need a new one?
November 10, 2016
  Followup from the Pelican Staff: First check that the coolant level is Ok. Then check the vehicle for fault codes. You could have an issue with the radiator outlet sensor or low coolant. - Nick at Pelican Parts  
Yangorang Comments: How does the electric coolant pump bleed air from the system if the cap and bleed screw are sealed?
October 31, 2016
  Followup from the Pelican Staff: It circulates the coolant. Air comes to the top, removed when topped up. - Nick at Pelican Parts  
SAM Comments: i have replaced thermostat & waterpump on BMW E90 330D 2006,the car is running fine but when ever I check water in the morning, the water bottle has pressure in it an it throws the water out,i am not getting any warning lights I drove to 1000km no problems,what can I do to sort this out
October 24, 2016
  Followup from the Pelican Staff: If the engine is at operating temperature, the system will be pressurized. This is normal. - Nick at Pelican Parts  
Aneil Comments: I have a bmw 323i e90.
When i start the bleeding cycle, it only cycles for about 3 times and stops. I noticed when car is cold the waterpump actives and when the car gets hot it stops. The heart will blow hot then gets cold. The fan only turns on to full speed once to hot. Did i scan and got a waterpump activation fault and colent temperature sensor fault. Could it be the tempreturr sensor that is causing the waterpump to not work correctly.
October 16, 2016
  Followup from the Pelican Staff: MOre than likely the water pump is faulty. When bleeding, if the pump makes a ratcheting sound it is likely faulty. - Nick at Pelican Parts  
Brittney Comments: Hello! I have 2008 BMW 328i, my uppermost hose from the expansion tank to the radiator is leaking profusely. Also someone me put some k-seal in there when it first started leaking. It was in there for about 4 days driving about 10 miles a day. I would like to flush the system myself, and replace the hose. My questions are 1 do I replace the hose before flushing or after and 2 how many times do you suggest I flush before final fill and bleed?
September 24, 2016
  Followup from the Pelican Staff: I would replace the hose, then flush.

I would flush with water until you are sure the system sealer you used is out. Then drain the water, add coolant and bleed. - Nick at Pelican Parts
 
Pat Comments: Hi there, my 2006 325 has been overheating and I believe it is my thermostat or water pump that needs to be replaced. When I do this bleed procedure my pump turns on but only pumps for 2 seconds on the 2 seconds off repeating not 12 minutes as you indicated. Can I Conform that my pump needs to be replaced? Hoping it's the thermostat only but probably electric water pump. Is there any other way to diagnose pump vs thermostat?
September 12, 2016
  Followup from the Pelican Staff: Sounds like the pump may be faulty, especially if making ratcheting sounds. You can command it on with a BMW scan tool, doe sit run and stay on when commanded on? - Nick at Pelican Parts  
Ray Comments: Forgot to mention my operating temperature reaches 103c max when stuck in traffic and ranges between 95-98c on the freeway.
July 26, 2016
  Followup from the Pelican Staff: Still in the normal range. I think these engine are running a little hotter than older models. - Nick at Pelican Parts  
Ray Comments: There is no middle mark reason being like all E90's or at least to my knowledge there is no physical temp gauge. I have to unlock a code using my vin to display engine temperature, which is shown digitally.
July 25, 2016
  Followup from the Pelican Staff: Ah sorry about that, flaked on your model year when I was answering.

90 - 100 c is in the normal range. - Nick at Pelican Parts
 
Zedolph Comments: Hi Nick, Can you please do a DIY on flushing a clogged A/C heater core for E90. Thanks
July 20, 2016
  Followup from the Pelican Staff: To flush, remove the hoses from the heater core, hook a hose from the outlet to a bucket, then run a hose to the inlet and allow water to run through. My guess would be you are better off replacing it. - Nick at Pelican Parts  
Ray Comments: Can you please tell me what is the correct operating temperature for my 2006 320i e90 msport.
July 18, 2016
  Followup from the Pelican Staff: We didn't have that engine in the US. The temp gauge should run about in the middle. - Nick at Pelican Parts  
Gavrosh Comments: Dear Nick, i have to update some news, the water pump procedure is still doesn't work, but I have bleeded manually by over filled the tank and I'm started to press the bigger hoses, a lots of air came out from the system, the hoses is got taut and then i sucked out the water till the right level. I Did screw back the cap, I had unscrewed the bleeder screw, there is also air came out first, And then screwed back. When I pressed by hand the hoses is feel like there was nothing else just liquid. I did start the engine then I kept running till a minute about. And I did keep doing the pressing, the air out by hand from the hoses for about 30 minutes I had repeat these steps. Now the water circling, I kept running the engine till 30 mins to get the right temperature. Even if I keep running the engine on 2000 rpm the temperature is 102. The fan is turn on by self, that's mean there's the water circling in the radiator as well. I'm know that's is a weird procedure but looks like helped out. What do you think about it?
Regards
June 24, 2016
  Followup from the Pelican Staff: You may have an air pocket trapped. I would assume it is all sorted now with the extended method you used. - Nick at Pelican Parts  
Gavrosh Comments: Dear Nick, I did forgot to write it down in the second time I kept the battery on charge, and it's didn't goes flat. does it make any different about your opinion ?
My car is BMW e90 320i n46 b20b
June 24, 2016
  Followup from the Pelican Staff: The water pump may be faulty then. - Nick at Pelican Parts  
Gavrosh Comments: Dear Pelican Parts I having problem with the bleeding procedure, I have drain the coolant, unscrewed the bleeder screw, filled up with new coolant, till the liquid is started overflowing. i did screw on the bleeder and started the electrical bleeder procedure. Ignition ON heating maximum blow minimum, then press the pedal till 10-15 secs. After it all the power gone even the central lock, lights, because of the low battery. I have charged a couple of hours, and then repeat the same procedure. But when I'm pressed the pedal I started to hear a noisi beeping from the engine, from the right hand side between the oil filter housing and the air system house there is a black plastic box with steel frame. It's starting to beep when I'm press the pedal, and if I'm stop the pressing after 5-10 secs it's does 1-2
Click and stop. Nothing else happen. There is still a lots of air inside the water system and I can't bleed it out. Could you help me out?
Thank you
June 23, 2016
  Followup from the Pelican Staff: Sounds like your battery is too weak to run the bleeding procedure. I would test your battery to see if this is the case. - Nick at Pelican Parts  
wiscokid81 Comments: When I do the bleed procedure on my 2011 335i the water pump is pumping except I want to note that while bleeding, my engine fan is on high, is that normal? While idling or driving the car doesn't overheat and the fan isn't on. Just during the bleed procedure.
June 22, 2016
  Followup from the Pelican Staff: I have not seen that, so I would assume not normal. Check the DME for fault codes. Possibly something stored during bleeding. Maybe the pump locked up for a moment. - Nick at Pelican Parts  
Reuben Comments: I recently replaced my thermostat and water pump 07 328. I believe I have air in the line that is causing over heating. I can't seem to get it out. I have tried a series of steps that should activate an air bleeding process but as far as I can tell, the pump won't start up. It only seems to run with the engine running. However the bleeding process won't work with the engine running w/ an electric pump. Any insight?'
June 16, 2016
  Followup from the Pelican Staff: If you are convinced it is trapped air, I would try running the engine briefly to bleed. Then try the bleeding process again. if it doesn't bleed, you will have to drain the system and use a vacuum filling tool. - Nick at Pelican Parts  
DJMK4 Comments: It turned out that its probabably the newer models you can initiate it.

After bleeding and taking out for a drive the water pump kicked in.
June 15, 2016
  Followup from the Pelican Staff: I haven't heard that, not in BMW literature either. Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
DJMK4 Comments: Iv followed this, BMW 320D E90 163bhp M47 but I cant get my electic water pump to come on, it was working before

Do i need a battery??
June 11, 2016
  Followup from the Pelican Staff: Not sure. Does the pump have power and ground when the engine is running?

- Nick at Pelican Parts
 
Seddie134 Comments: I want to know how to install the radiator drain plug unit as I turned the black hexagon piece the drain plug screw attaches too so I would like to know how to install the whole unit into the radiator on a 2008 bmw 328xi e90
June 1, 2016
  Followup from the Pelican Staff: You may want to replace the sealing O-ring, if available. It should be as simple as tightening it clockwise. - Nick at Pelican Parts  
Kyle Comments: Problem solved, for anybody replacing chilling system parts make sure your connections are firmly seated, use the push pull push process which is standard for all bmw connections. The mechanic didn't properly seat the connection to the electric water pump causing it to malfunction. Goes to show Ebel the worst problems are simple fixes sometimes, and also, do the work yourself if you have the means to.... or use a mechanic you trust... thanks anyways guys
May 21, 2016
  Followup from the Pelican Staff: Thanks for sharing your installation process and experience. These type of comments add so much to the Pelican tech community.
- Nick at Pelican Parts
 
Kyle Comments: I have a 2006 325i e90? I think.... anyways, I've replaced the thermostat aND started trying to put fluid in the car... for a while I was doing a sort of "manual bleed" then realized it needed to be initiated through the other process... tried to get the pump to initiate bleed process but, nothing.... couldn't get it to work for some reason.... any help would be appreciated thank you!
May 21, 2016
  Followup from the Pelican Staff: If the pump doesn't turn on, it may be faulty. Check the signals to the pump to be sure. When you initiate the bleed process, the pump should be powered on. - Nick at Pelican Parts  
Ramin Comments: I also have overheating issue with my 06 330i, I replaced the water pump with my 08 bmw 528i which look identical.
when I do bleeding process the pump make a light noise and vibrates a bit, but no coolant comes out of the bleeding opening in the expansion tank. during bleeding process when i touch the hose under the expansion tank it kind of vibrates.
am i using the wrong water pump, or what else could be the issue. Thank you
May 4, 2016
  Followup from the Pelican Staff: if it was a used part, I would assume it is faulty. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
deez nutz Comments: Thanks for the follow up. Your hearing is clearly better than mine cuz I couldn't hear anything. I ran the bleed again the next day and took the cap off and could visually see the coolant moving.
March 29, 2016
  Followup from the Pelican Staff: Thanks for the follow up. - Nick at Pelican Parts  
deez nutz Comments: When bleeding, how do you know if the coolant pump is running. E90 n52. I don't hear anything and there is nothing in my instrument cluster saying it is running.
March 26, 2016
  Followup from the Pelican Staff: You can hear it click on and off. That and the flow of coolant in the reservoir. - Nick at Pelican Parts  
Humii Comments: I have a 2007 bmw e92 320d msport. The radiator fan comes on straight away when i start the engine and never goes off. It gets very loud aswell. What could cause this to happen?
February 22, 2016
  Followup from the Pelican Staff: A faulty coolant sensor or cooling fan. - Nick at Pelican Parts  
Workman20613 Comments: What do you mean an engine drivability fault?
February 15, 2016
  Followup from the Pelican Staff: A problem with engine performance. (drivability) - Nick at Pelican Parts  
workman20613 Comments: After I completed the flush, I noticed that when cold the measuring stick marks almost to the max fill line but I did not use two gallons completely of antifreeze. Also, I noticed that before the flush I was getting 27 mpg now everyday it is decreasing but my driving hasn't changed. Is this related to the coolant level?
February 13, 2016
  Followup from the Pelican Staff: DOubtful. MPG decrease is an indicator of a engine drivability fault. - Nick at Pelican Parts  
Eric Comments: I'm still lost on why you don't keep the bleeder screw open, or expansion the expansion tank cap off when bleeding the system. If the system stays closed, how can air bubbles escape? I thought the point of the bleeder screw was to leave it open during this process?
February 2, 2016
  Followup from the Pelican Staff: The procedure is created by BMW for their vehicles, this is a procedure based on their's. Try your method and let us know how it works. - Nick at Pelican Parts  
Archie Comments: My 2006 325i 70k miles overheats when the AC is on. Pulled over and turned off the ignition to cool down, 5 mins later fan was still running after engine shutdown. Drove it again with AC off, over temp warning did not appear and the fan stopped right away upon shutdown. Inspected engine compartment no signs of leaks and coolant reservoir was full. Trying to illuminate water pump and thermostat in the picture. What could be the issue on this? Help please...
December 16, 2015
  Followup from the Pelican Staff: Check if the electric fan is running on high with the a/c on. if it is, the water pump or thermostat may be at fault. You can run the pump to test using the coolant bleeding procedure we have. - Nick at Pelican Parts  
Sarah Comments: Update on coolant bleed not initiating after coolant pump replacement: checked fuses. Had some confusion locating fuse for coolant pump as Haynes indicated it was in dme box and other sources indicated it was in power distribution block on top of battery. So I checked all fuses in both locations and all are ok. Coolant bleed still won't initiate. Am now wondering whether it could be the rubber seal in the coolant pump electrical connector, as your tech article on coolant pump replacement indicates these can become warped and not seat properly. With a firm tug I was able to pull the connector off and it had been on as far as I could make it go. So where can I find a replacement seal and/or electrical connector to see if warped seal is causing poor connection to coolant pump? Have scoured several sites but not found the part. Thanks!
September 20, 2015
  Followup from the Pelican Staff: We can get it. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
tu Comments: I have a 2006 320i BMW and the radiator light/indicator is showing up and I have only topped it up with water only and only lasted for 8hrs then the same light appeared , am I doing Something wrong or would this have an affect on the radiator
September 16, 2015
  Followup from the Pelican Staff: Can you share a photo of the warning light? I want to be sure it is a level issue.- Nick at Pelican Parts  
joe Comments: I have an e90 3 series 320i and I filed up the radsiator with water but I did not leave room to pour the antifreeze. what should I do
September 12, 2015
  Followup from the Pelican Staff: Drain and refill it with pre-mixed coolant. - Nick at Pelican Parts  
Sarah Comments: Thanks Nick. I'll give that a go and see what happens.
September 11, 2015
  Followup from the Pelican Staff: Thanks, let me know hat you find. - Nick at Pelican Parts  
Sarah Comments: I just changed the coolant pump and thermostat on my 2006 330xi many thanks for the tech articles on those procedures-couldn't have done without them. I have made sure all electrical connections are secure. After replacing radiator, cooling fan, and coolant I tried to initiate coolant bleed as per above with vehicle trickle charger attached but coolant pump does not come on. Battery charge remains somewhat low around 12.l-12.2V. Could somewhat low battery prevent coolant bleed from initiating? Or any ideas on what else might be the problem?
September 9, 2015
  Followup from the Pelican Staff: At 12 volts, the pump should run normally. I would check if the fuse for the pump is OK. - Nick at Pelican Parts  
Erik Comments: Follow-up on Mojo's question about draining the block: I drained my 2007 328i N52KP today and could only drain ~4L out of the system. I blew air gently trough the reservoir bleed screw, which pushed out another ~0.5L of coolant. Squeezing lower radiator hoses did not add any flow. Any suggestions for helping the block and heater coil to drain? The car was up on ramps...could the angle be an issue?
September 7, 2015
  Followup from the Pelican Staff: The best way is to remove hoses from the components and let it drain. Remove the lowest hose at the radiator, then the engine, then the firewall. - Nick at Pelican Parts  
joe Comments: I have an e90, 320i 2006 model.africa spec. I have replaced the top radiator cooling horse as the old one blew off the conector clamp. When I was try using your bleeding method. The pump does not run. Only when I start the engine and car is idling then I can see water tuning from the bleeder line. Is there a problem with the water pump? Why won't it run on its on and only run when engine is idling?
September 2, 2015
  Followup from the Pelican Staff: Not sure, I can't guarantee this procedure works on NON US vehicles. - Nick at Pelican Parts  
Sean Comments: Vacuum solernoid valve causing the problem if anybody gets this thump or a squeak
August 20, 2015
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it.
- Nick at Pelican Parts
 
Sean Comments: Hi there I have a thump noise but has soon has I pull the pipe that connects to the egr valve the one with the suction the noise goes away but the warning light on dash comes on! Put the pipe back on and noise comes back thump thump then goes has soon has pipe taken off, 330d m sport 2006 any help be great cheers
August 18, 2015
  Followup from the Pelican Staff: The EGR valve may be stuck open. You may be hearing the exhaust pulses. - Nick at Pelican Parts  
Sean Comments: Thank you for the reply I have been told egr valve making the noise has it stops when taking the suction pipe off it and main front pipe then starts once placed back on so may be egr and throttle body to be replaced
August 7, 2015
  Followup from the Pelican Staff: EGR? What vehicle? E90 models do not have EGR valves. - Nick at Pelican Parts  
sean Comments: Cheers for the reply I'm new to bmw and since dropped the rad I have now got a thumping noise coming from some where but only starts the noise while car ticking over and I was bleeding the system bleed screw then when you touch the revs it makes a thumping noise for a minute or so then stops then touch the pedel again and thumping starts again !! Have I got a air lock? All heaters working fine tho
August 3, 2015
  Followup from the Pelican Staff: I would check if something is hitting the fan shroud or drive belt. Check what you removed when you had the radiator out. - Nick at Pelican Parts  
sean Comments: Bmw 330d m sport sorry not 340
August 1, 2015
  Followup from the Pelican Staff: Thanks for the info. - Nick at Pelican Parts  
Sean Comments: I have 2006 340d m sport e90 auto diesel does my bmw have electric or manual water pump has everything I trying to turn it on with heating on and foot pedel down 10 secs it will not work cheers
August 1, 2015
  Followup from the Pelican Staff: Your model has a mechanical water pump, belt-driven. - Nick at Pelican Parts  
David Comments: Hi Nick,and on a European 330 diesel 245HP M-Sport MY 2010? Which is the procedure to follow? Thx, David from Europe
July 14, 2015
  Followup from the Pelican Staff: It may be similar to our article here. However, I don;t have info to confirm against European models. - Nick at Pelican Parts  
Rick Comments: My 2007 328i 4dr is overheating, I think it may needs a water pump. When I try the steps to turn on the pump to bleed the system it doesnt turn on, have tried it many times. Is that a clear indication that the water pump is not functioning? Also, the coolant level stick inside the expansion tank is broken but the coolant level is fine, could that cause the car to overheat because the system doesnt know how much coolant is in the tank? Thx for your response.
July 3, 2015
  Followup from the Pelican Staff: Could be a a faulty pump. To be sure, try to activate it using a BMW scan tool. - Nick at Pelican Parts  
Rocky Comments: Awesome write up! Thanks.
July 1, 2015
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Randall Comments: Solution! I missed a step! Insert key fob, press the start button without touching the brake pedal. Then go thru the heater settings and 10 sec gas pedal routine. Water pump then cycled as described. Remove cap, adjust level, and I'm done. Woo Hoo!
June 24, 2015
  Followup from the Pelican Staff: Thanks for the follow up. We appreciate it.
- Nick at Pelican Parts
 
Randall Comments: I have been bleeding the system by running the engine. Heat to max, low fan speed. Then I crack the bleed screw and watch for bubbles or foam. Will this work. Key in, throttle routine doesnt seem to work for me. 2010 328xiT
June 24, 2015
  Followup from the Pelican Staff: Your results: Insert key fob, press the start button without touching the brake pedal. Then go thru the heater settings and 10 sec gas pedal routine. Water pump then cycled as described. Remove cap, adjust level. - Nick at Pelican Parts  
Randy Comments: Thanks for all your info. My 2006 325xi has been overheating for some time. In order, I've had the radiator flushed, I've replaced the overflow cap, I replaced the thermostat, just replaced the radiator. I hadn't seen the air purge procedure until the radiator replacement. When doing that my water pump comes on, the off, then on, the off. I'm assuming this is not normal, and the water pump needs replacing. I've got one in my cart here at Pelican parts ready to pull that $409 trigger. Does it sound like that's the problem. - thanks
June 5, 2015
  Followup from the Pelican Staff: If the water pump does not run all the time, it is likely faulty. Try the bleeding procedure to confirm it stalls. - Nick at Pelican Parts  
Thembi Comments: Good day
My car E90 2007 310i auto blow top gasket, so now is been repaired but when clearing the yellow Colent sign it doesn't cleared. Water is there I check it every morning. The stick in the tank for measurement is broken. Can the stick level cause that?
May 26, 2015
  Followup from the Pelican Staff: Could be the level sensor is the tank is faulty or stuck. I would start there. - Nick at Pelican Parts  
Guillermo Comments: On step 6, I see that the hose has a clamp with a screw that tightens it. My E90 has a different type of clamp, that kind that has a wire clip and you pull on it to loosen it. I tried different methods to remove this hose but there is not enough room to do it. Any suggestions?
May 20, 2015
  Followup from the Pelican Staff: Can you share a photo of the clamp you have? - Nick at Pelican Parts  
Ryan Comments: FYI this will not work for the 335i. The intercooler is in the way on my 2008 335i.
April 27, 2015
  Followup from the Pelican Staff: That is correct, for turbocharged models, the intercooler has to be removed.

Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 
Rich Comments: Where do I check if my coolant is leaking?..
April 14, 2015
  Followup from the Pelican Staff: See this tech article:

http://www.pelicanparts.com/BMW/techarticles/BMW-3-Series-E90/WATER-Cooling_System_Leak_Test/WATER-Cooling_System_Leak_Test.htm - Nick at Pelican Parts
 
samy Comments: hello i have a 2006 330i i have a problem and its that my vehicle is overheating, i change the thermostat and the radiator, water pump and fan is working normal and for some reason i still have air in the engine, I practice the Bleeding Procedure many times but the car still overheating, is anyone there can help me with this issue.
March 30, 2015
  Followup from the Pelican Staff: I would pressure test the cooling system. If the system will not hold pressure and there are no external leaks the head gasket may be faulty. - Nick at Pelican Parts  
bmw242 Comments: I have a European right hand drive 2006 e90 320i will these steps work for me as well?..I'm fairly new to vehicles but I've been working with electrical components for 10+ years..I want to get my car serviced but my dealer says my vehicle is too old to be put on the computer to read..says it will cause 'firing'..do the maintenance articles cover a professional service?
March 17, 2015
  Followup from the Pelican Staff: I can't be sure as I haven't worked on a Euro version, but I bet it will be fine. Give it a try and let us know. - Nick at Pelican Parts  
JK07 Comments: Hi
Quick Question. Before attempting to change the coolant with your directions I wanted to make sure the electric pump comes on with ignition On and temp set to high and fan speed to low press gas pedal for 10 secs. I performed this step several times but cant hear the pump coming on. Its a 2007 BMW E90 320i. What am I doing wrong here please advise thanks
March 15, 2015
  Followup from the Pelican Staff: That is what it takes to turn it on. It should run. - Nick at Pelican Parts  
MoJo Comments: 2008 328xi e90 N51, how come you do not suggest draining from the engine block? Does draining from the thermostat take care of that?
February 26, 2015
  Followup from the Pelican Staff: Some coolant will remain behind. There is no block drain on these models (E90).- Nick at Pelican Parts  
ranbdal Comments: The electric coolant pump has been running 30+ minutes for me. Opened the top after 15+ minutes and there was a small amount of air but nothing big.
January 31, 2015
  Followup from the Pelican Staff: Are you having trouble bleeding the system? - Nick at Pelican Parts  
Simo Comments: Good going was looking for DIY info...thank you...I would like to ask if u suspect there are unwanted stuff in your cooling system can ypu leave your drain plug out and run distilled water through the system? How would that work?
January 9, 2015
  Followup from the Pelican Staff: Best bet is to remove the lower radiator hose and run water through the radiator. Allow it to drain out the other end. - Nick at Pelican Parts  
Ryan Comments: What is the purpose of Step 7? If you fill it to the max mark, then open the bleeder and fill until it spills out step 8, why bother filling to the max line in step 7? Am I missing something?
December 2, 2014
  Followup from the Pelican Staff: The coolant level has to be high enough to overcome the air trapped in the system. - Nick at Pelican Parts  
ants Comments: Hi, could someone plz help me with the procedure for bleeding my 2007 E90 steptronic BMW 320i.The only procedures I find is for electronic water pumps.I had a new radiator fitted and new upper hose fitted. I don't think the guys bled the system correctly, because the upper hose gets very very hot and lower hose cold. I've already lost one upper hose, which seems to of got very hot and broke off. Your help will be highly appreciated.Thanks
August 24, 2014
  Followup from the Pelican Staff: We don't have your vehicle or engine here in the US. I imagine it is similar, I would grab a repair manual. It will have the procedure. - Nick at Pelican Parts  
James Comments: Getting ready to do this but haven't been able to find a DIY specific to the M3. Anything different for my 2008 e93 M3?
August 8, 2014
  Followup from the Pelican Staff: I think the reservoir is different. I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Toby Comments: In very last step, "run engine at idle to operating temp and check for leaks," I assume this is done with cap screwed on expansion tank?
August 1, 2014
  Followup from the Pelican Staff: Yes, as stated here: Install expansion tank cap and be sure all bleeder screws are tight. Turn ignition ON (do not start engine), set temperature controls in vehicle interior to full warm and blower fan speed to Low. Press accelerator pedal to floor and hold down for ten seconds. Electric coolant pump will run for about 12 minutes to circulate coolant and bleed air from cooling system Once pump has run the cycle, check level of coolant in expansion tank and adjust as needed. Start and run engine at idle until it reaches operating temperature and check cooling system for leaks. - Nick at Pelican Parts  
jrhjrhjim Comments: I thought the turbo intercooler had to be removed to do a coolant change on turbo equipped cars-in our case a 2008 335i convertible. Not required?? If required, can the steps be added to your article with mention of any special tools needed? Great articles-thank you!
July 12, 2014
  Followup from the Pelican Staff: Not as far as I know. If you have any doubt, I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Tay Comments: Have not got round to doing my coolant flush on my e90 330i yet but will be doing so in the next couple of weeks. Have 1 more question for you regarding the last step. When bleeding the air out of the system are you sure that the expansion tank cap is to be tightened back on before running the pump? If so how does the air leave the system with it no where to go? Should the cap be off when running the electric water pump for this reason? Just want to triple check everything over before I do the job as I like to make sure I have done everything correctly to the T. I'm used to burping the system manually in the past with all my toys, so this process is a little new to me. Pls do confirm with me on this then when you can. Again thank you very much in advance and keep up the great work and educating us folks that like to work on our own cars our self's with these articles.
Again Thank you so much
May 17, 2014
  Followup from the Pelican Staff: You can do it either way. BMW suggest leaving the cap in place. Large amounts of air are removed when you fill the cooling system with the bleeder removed. Once the initial bleed is complete, you are instructed to remove cap and adjust level. - Nick at Pelican Parts  
Tay Comments: As usual, Excellent and easy to follow step by step directions to preform not the easiest own maintenance for us DIY ers. Thank you very much for your great efforts with these post's. Very much appreciated!.
1 quick question i have, When preforming the last step running the
electric coolant pump should a battery charger be hooked up to the battery in the back and or the jump points in the engine bay and set to fast charge for those 12 mins also to prevent battery drainage? If so should the battery charger be installed directly to positive and negative terminals on the battery directly or just install to the positive terminal and a metal bolt for ground in the engine bay? Thank you very much in advance.
February 25, 2014
  Followup from the Pelican Staff: You want to avoid using a battery charger on modern cars. You want to use a vehicle power supply. However, if you battery is in god shape, you do not have to connect anything during the procedure. If you choose to, I prefer to connect the vehicle power supply under the hood. - Nick at Pelican Parts  

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