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BMW Cooling Fan Replacement
 
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Pelican Technical Article:

BMW Cooling Fan Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$200

Talent:

***

Tools:

T20 Torx driver, Flathead screwdriver

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 cooling fan

Hot Tip:

Work with a cool engine and clear DME fault codes when done.

Performance Gain:

Proper engine cooling.

Complementary Modification:

Inspect radiator and coolant hoses

BMW E90 models utilize an electronic cooling fan integrated into the cooling fan shroud. When repairing, the cooling fan and shroud are replaced as a unit. The cooling fan is responsible for maintaining proper engine coolant temperature and A/C cooling. When a BMW E90 cooling fan fails, the fan will not activate or only activate at high speed. 

When replacing your electronic cooling fan, you will want to work with the engine cold and disconnect the battery negative cable. Disconnecting the negative battery cable will prevent the electric cooling fan from starting while being serviced. The fan could start at any time and personal injury can occur, don't skip this step.

Working in trunk, disconnect battery negative cable and cover battery terminal so cable does not accidentally come in contact with disconnected cable. See our tech article on battery replacing for notes on disconnecting and reconnecting battery.

Remove engine splash shield. See our tech article on splash shield removing.

Working at front of radiator support, remove two T20 Torx fasteners from the intake duct.
Figure 1

Working at front of radiator support, remove two T20 Torx fasteners from the intake duct. (green arrows)

Working at intake air duct connection on air filter housing, using a small flathead screwdriver, release retaining tabs on each side and pull duct off.
Figure 2

Working at intake air duct connection on air filter housing, using a small flathead screwdriver, release retaining tabs on each side and pull duct off. Normally-aspirated engine shown. For turbocharged engines, the duct on the radiator support unscrews the same as the previous step, the duct for the air filter housing is also removed the same way, the air filter housing is in a different spot. Follow duct and release tabs to remove duct.

Then, pull intake duct out of radiator support and remove from vehicle.
Figure 3

Then, pull intake duct out of radiator support and remove from vehicle. (green arrow)

If your vehicle has an automatic transmission , you will have to remove ATF cooler from cooling fan shroud.
Figure 4

If your vehicle has an automatic transmission , you will have to remove ATF cooler from cooling fan shroud. Working under the left side of the radiator, remove ATF cooler fastener (green arrow).

Then pull cooler off cooling fan shroud.
Figure 5

Then pull cooler off cooling fan shroud. Once you remove cooler from shroud, you can lay it aside.

Working at top of cooling fan, disconnect cooling fan electrical connector by pressing release tab and pulling apart.
Figure 6

Working at top of cooling fan, disconnect cooling fan electrical connector by pressing release tab and pulling apart. (green arrow)

Working at top of cooling fan, pull hose out of plastic mounts (green arrows) and lay aside.
Figure 7

Working at top of cooling fan, pull hose out of plastic mounts (green arrows) and lay aside. If your vehicle has a turbocharger, remove duct from rubber mount on cooling fan shroud by pulling up and off.

Working at right side of cooling fan, remove wiring harness mount from cooling fan by pulling out.
Figure 8

Working at right side of cooling fan, remove wiring harness mount from cooling fan by pulling out. (yellow arrow) Wiring harness mount if it is a push in tree style clip, you can lever it out using an interior trim panel tool. Then remove T25 Torx cooling fan fastener (green arrow).

Working at left side of cooling fan shroud, disconnect lock to release cooling fan.
Figure 9

Working at left side of cooling fan shroud, disconnect lock to release cooling fan. Lock is released by pressing tab (green arrow) toward engine firewall.

Then pull cooling fan up and remove from engine compartment.
Figure 10

Then pull cooling fan up and remove from engine compartment. Be careful not to snag fan on wires or hoses.

When installing new cooling fan.
Figure 11

When installing new cooling fan. Slide down into engine compartment, move into place then lock retaining tabs. Be sure fan is properly seated in radiator support. If fan is giving you a hard time and will not drop all the way down, check to see if bottom of cooling fan is hung up on radiator. ( green arrow). From below, check fan shroud clearance at radiator, if needed, gently lever fan away from radiator then slide down and lock into place. Reroute wiring harness and connect. Install air ducts and reinstall ATF cooler (if equipped). Install engine splash shield and check cooling fan operation. You can check operation by running engine and turning on A/C, cooling fan will run when A/C is switched ON.

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Comments and Suggestions:
Yangorang Comments: There seems to be both a 400W and a 600W fan for the N52 engine. Can either fan be installed on the 17117562079 radiator?
November 12, 2016
  Followup from the Pelican Staff: I am not sure. i think it depends on vehicle equipment.

Give The Pelican Parts parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
Ben Comments: Yes I replaced the entire fan assembly, I checked the wire by the DME and am still only getting the 2.5 volt reading that is the same as the power wire at the plug. I know the relay is built into the fan so there is no additional relay to check. At the back of the fuse box I am getting 12 volts but the wiring diagram shows the wire comes straight from the fuse box to the fan. I cannot figure out why I would be getting 12 volts at the back of the fuse box but only 2.5 on the power supply to the fan. I checked the DME wire that control the speed and it is reading 4.5 so I know it is getting power from the computer.
October 26, 2016
  Followup from the Pelican Staff: If the fan has power and ground on the large wires. Check if the adding ground to the small wire turns the fan on. Use an incandescent test light to ground, any other method could damage the DME. - Nick at Pelican Parts  
Ben Comments: I have a 2007 328xi and cannot get the fan to come on. I have checked the fuse, and when I test the plug I am getting 2.5 volt reading. I replaced the temperature sensor with no luck, I had the code pulled and it said internal fan failure so I put another fan in and it still did not work. if I run a jumper to the original fan it comes on fine. Any suggestions?
October 25, 2016
  Followup from the Pelican Staff: You replaced the entire fan, not just the motor? If so, check the wiring from the fan to the DME. - Nick at Pelican Parts  
Junior 88 Comments: I have a 2006 525i automatic. The car was driving fine until one day it started to over heat. Then I towed it home and checked it out, i turned the car on to see if it will start to over heat again and it did. I also noticed to radiator fan didn't turn on. Do you know where I can locate the fuse trunk or glove box and what fuse number is it?
August 21, 2016
  Followup from the Pelican Staff: I don't have the wiring for your vehicle. The fuse panel should have a white fuse card, listing the components the fuses run.

I would grab a repair manual. It will have the info.

Give our parts specialists a call at 1-888-280-7799- Nick at Pelican Parts
 
tinoh Comments: Would u happen to know where the coolant fan relay would be for 2007 bmw 328I ?
August 17, 2016
  Followup from the Pelican Staff: If you want to turn the fan on, you will need to remove it, then separate the harness at the fan motor, supply fused power and ground to the fan motor.

the DME controls the fan. The fan is supplied power and ground all the time by the vehicle electrical system via a cut out relay. if the fan has power and ground on the large wires with the engine running the relay is working.

I would grab a repair manual. It will have the wiring and component locations.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
tinoh Comments: I am checking the harness coming from the fuse box. The one that connects into the coolant fan. I'm reading 4.3 volts. Also am getting a 2efe code, fan activation. I replaced the whole fan assembly but it still doesn't turn on. Correct me if I'm wrong but if i wanted to check the fan motor I would run it directly to the battery and it should turn ?
August 17, 2016
  Followup from the Pelican Staff: If you want to turn the fan on, you will need to remove it, then separate the harness at the fan motor, supply fused power and ground to the fan motor.

the DME controls the fan. The fan is supplied power and ground all the time by the vehicle electrical system via a cut out relay. if the fan has power and ground on the large wires with the engine running the relay is working.

I would grab a repair manual. It will have the wiring and component locations.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
tinoh Comments: I have a 2007 bmw 328I e90 , can u please tell me how many volts are supposed to be coming from the cooling fan harness .
August 14, 2016
  Followup from the Pelican Staff: What terminal and wire color are you testing? - Nick at Pelican Parts  
Chuks Comments: I have a 2009 BMW X5. The fan delays before coming on when started without the AC. But when started with the AC the fan runs. Do I need to replace d fan or fuse? Pls What do I do?
July 16, 2016
  Followup from the Pelican Staff: Then engine cooling fan or blower motor? Please describe the delay, are you commanding it on? - Nick at Pelican Parts  
saad328i Comments: hey i have 2007 328i and the car is overheating due to the fan not spinning. there is no power coming to the plug plugging into the fan itself. is there any suggestions on what could be wrong or what part might be causing the problem
July 14, 2016
  Followup from the Pelican Staff: The fan may have blown the fuse. I would grab a repair manual. It will have the wiring and fuse locations

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
heyzoot Comments: '08 335 e93
Cooling fan won't come on - as a result hard shifting and A/C compressor wont engage.
yellow temp warning so turned off engine and let cool down.
temp circuit maxi fuse blown replaced and immediate blows another -hard short.
No fault codes thrown.

unplug fan and next fuse still blows.
turn on car and signal wire reads ~4.3 volts.
remember youtube video of guy whose fan wire coating cut inside electrical tape on top of radiator that powers fan.
unwind tape to reveal short although it wasn't touching metal fan shroud is plastic or another wire as their coating was intact. -very strange Many wire strands broken so wire as effectively thinner at that point.
Replaced bad section with connector glued ends for moisture repellant and re-taped wires.

Inserted new fuse everything back to normal shifting, a/c and fan


REmembered a youtube video of a guy
June 30, 2016
  Followup from the Pelican Staff: Thanks for sharing your diagnostic process and experience. These type of comments add so much to the Pelican tech community.
- Nick at Pelican Parts
 
Bix Comments: What is the max current draw of this OEM fan? Which fuse is it on a 08 E90 335i N54
May 29, 2016
  Followup from the Pelican Staff: Usually fuses are rated about 1.5 times the standard circuit load. You can use a wiring diagram and fuse rating to determine the draw. I don't have that info, as it is not supplied by the manufacturer.

I would grab a repair manual. It will have the wiring and fuse rating.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
sam Comments: i replaced my fan on my 2009 bmw 328xi and the had to connect the wires together the connections were different where is the fuse for it
May 24, 2016
  Followup from the Pelican Staff: I don't have the wiring for your vehicle.
I would grab a repair manual. It will have the wiring and fuse info.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
328xifan Comments: 2007 328xi
Car overheated. Towed it home and checked codes. 2EFE, e-fan control.

Tried to turn the fan on with scan tool, but it never turned on.

Cleared the codes and ran the car with the A/C on, caused the same code again, and the fan never turned on.

Since a replacement fan isn't returnable, are there any other tests I can do to be sure that it's the fan and not any electronics?
May 24, 2016
  Followup from the Pelican Staff: You can confirm the DME is trying to activate the fan, when commanded on with the scan tool. - Nick at Pelican Parts  
arl Comments: Took my car in because my A/C isn't blowing out cold air. I was told to replace my radiator fan because "it doesn't start up right away" when the car is turned on. It starts winding within seconds. No noise. Does it need to be replaced?
May 4, 2016
  Followup from the Pelican Staff: I can't say without knowing what method they used to diagnose it. It is possible it is faulty if it starts slow, then gets to normal speed. - Nick at Pelican Parts  
riso1988 Comments: Hey there - 2006 330xi. Cooling fan will not come on at startup, with AC on, when the lower radiator temp sensor is disconnected. I replaced fan and still nothing. I have 12V at the harness. Any suggestions?
April 27, 2016
  Followup from the Pelican Staff: Is there ground as well? Next step after that would be to command the fan on using a BMW scan tool. - Nick at Pelican Parts  
Quido Comments: Cont. - I also completed the water pump test to bleed the system
March 19, 2016
  Followup from the Pelican Staff: OK, got it. - Nick at Pelican Parts  
Quido Comments: 2006 BMW 325i 6-speed Manual

My fan stopped working all of a sudden, but when I open the hood and gently touch the blade, it spins automatically. So i bought a new fan and installed it on yesterday, flushed the radiator and I replaced the temperature switch.....the same thing happened, the fan only works for a period of time after I touch it, then it stops, the A/C gets warm and then the warning alerts pop up.

Has anyone ever experienced this? What can I do now?
March 19, 2016
  Followup from the Pelican Staff: Have you checked the ground and power feed to the fan? There may be an issue. Best bet is to voltage drop test them both. If good, you will want to run a function test using a BMW scan tool. - Nick at Pelican Parts  
Mehdi aminian Comments: Very useful,thanks
March 17, 2016
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
kronk Comments: Correction - Misspoke when I said manifold. I believe the broken fitting is actually into the cylinder head. The fitting is an integral part of the hose which is now detached because of the failed fitting. The fitting attaches into the head with two bolts. I believe the other end of the hose goes to the electric thermostat but I have not yet verified this.
January 13, 2016
  Followup from the Pelican Staff: You should be able to remove the fasteners are get the broken hose end out. Then replace it with new. Be sure the bore is free from corrosion. - Nick at Pelican Parts  
kronk Comments: 2009 335i Turbo Sedan - The coolant hose fitting at the engine manifold is broken and integral hose has fallen off. I can't find any instructions for R&R of this hose goes to electric thermostat?. Is it best to remove radiator fan to replace this? Also, I recently replaced thermostat and pump which was not fun. Do I need to remove these again to get to the other end of this hose?
January 13, 2016
  Followup from the Pelican Staff: Can you share a photo of the hose? Then I may be able to offer some advice. - Nick at Pelican Parts  
Foz Comments: My engine fans not coming on ever and has power to it, spins freely. I'm gonna order a fan online but don't know if my 08 335i hardtop conv. Is a e92 or e93. Can you help
December 29, 2015
  Followup from the Pelican Staff: Should be an E93. - Nick at Pelican Parts  
Rone Comments: hi i Replaced cooling fan after accident but it does not work it get great signal to the fan.dont what else to do
2006 325i BMW 3.0
October 16, 2015
  Followup from the Pelican Staff: If it gets a good signal and doesn't run, the fan is faulty. - Nick at Pelican Parts  
Doug Comments: How can I test the electric cooling fan before I purchase a new one for a 2007 328i N52
October 13, 2015
  Followup from the Pelican Staff: Using the fan test in a BMW scan tool. - Nick at Pelican Parts  
TMGP Comments: Great DIY. The part of disconnecting the Automatic Gear Cooler was great. Thanks so much
October 13, 2015
  Followup from the Pelican Staff: Thanks for the feedback. Glad we could help.
- Nick at Pelican Parts
 
Ryan Comments: 2007 328 N52 6MT.
My fan is very noisy and can be heard for some time after I turn off the car, winding down. Opened hood and it seems to rotate off axis a little. No codes or overheating. Could it be something installed incorrectly/not snapped in place? Trying to avoid paying $600 for a simple fan.
September 22, 2015
  Followup from the Pelican Staff: If noisy, the bearing may be faulty causing it to rub. I would check it and replace if necessary. - Nick at Pelican Parts  
johnnynguyen190 Comments: my car is an 2006 330i, it overheat only at high speed when the a/c is on.
September 21, 2015
  Followup from the Pelican Staff: Check the DME for water pump fault codes. Also check if the cooling system is full. - Nick at Pelican Parts  
teto10 Comments: Hi, can you tell me where is the fuse of the radiator fan?, l have a bmw 325i 2011,
August 9, 2015
  Followup from the Pelican Staff: In the US, there was no 2011 325i.

On US 328i models: Fuse 107 100 amp. - Nick at Pelican Parts
 
Sal Comments: Hey man. Replaced cooling fan after accident .. Cooling fan wasn't responsive till today when I unplugged it and plugged it back in but now I'm noticing that it doesn't work every time the battery is having problems. The problem with the battery's that there is a main red cable that doesn't always make full contact that's in this box so every time my car doesn't start I go back there, wiggle it till it makes contact then it works. Now I'm seeing that the canoe is hot just as much as inside the engine. Could the problem with the cooling fan be because of that?
August 3, 2015
  Followup from the Pelican Staff: If your vehicle has a battery safety terminal, it may not be sending power to all the components. These types of cables will detach after a crash. I would start there. - Nick at Pelican Parts  
jason Comments: I have an 06 330I that the fan seems to rev way up and then way down repeatedly upon cold start ups. It dosen't seem to do it after warmed up. Is this a fan or coolant temp sensor problem? Thanks in advance.
July 20, 2015
  Followup from the Pelican Staff: Could be either. I would check coolant temp sensor reading when the engine is cold, then monitor it when you start the engine. If it is steady and matches ambient temp,t he issue is likely the fan. - Nick at Pelican Parts  
Jasu Comments: Should I check for coolant temp sensor?
Water pump and thermostat seems to be working, I will do a bleeding procedure to confirm waterpump functionality. Do get cold and hot air inside the car, so thermostat is ok.

So you think its continious misfire thats causing overheating and that's probably causing the limp mode?


BTW, thanks a lot for your answers
June 12, 2015
  Followup from the Pelican Staff: I would check compression, spark and fuel as I mentioned earlier. If we keep speculating, we get no resolve. Need to do some testing. - Nick at Pelican Parts  
Jasu Comments: ok I will check spark and fuel.

Oil cooler thermostat, if it is stuck, can this cause an issue?
I don't know how misfire is detected, rough idle? But if it is causing overheating then it does explain some things.
June 12, 2015
  Followup from the Pelican Staff: I don't think so. If anything, oil temp issues - damage if too hot to engine. - Nick at Pelican Parts  
Jasu Comments: Hi Nick

Don't have a scanner tool to run the test. I used Cobb AP to pull codes, don't think it can pull shadow codes.
BTW, My motor is 2011 N55 335i, built date is 06/10,
the P2EEF and P2EFE codes are cylinder misfire codes for N55, and they're electric fan issues for N54.

Regardless, when I clear all the codes with Cobb Accessport, reset ecu, I take the car for a drive. The car goes into limp mode halfway between 180 and 250 Fahr.
I have factory oil cooler, so google search says it might be oil cooler thermostat is stuck, is this possible?
June 12, 2015
  Followup from the Pelican Staff: Shadow codes? Do you mean pending?

Can you feel a cylinder misfire? I have not seen an oil cooler cause a misfire, I have seen overheating cause one.

I would check spark, fuel and compression on all cylinders.- Nick at Pelican Parts
 
Jasu Comments: Hello
Been getting P2EEF and P2EFE on my 2011 BMW 335i, has factory oil cooler. Cleared codes whenever I see fault codes. Now the oil temps stay between 180 and 250 Fahr., usually they're about 240, and I get limp mode after a little driving. And I could hear the fan now. A/C works, hot and cold air is good. Waterpump and tstat recently replaced. No startup issues except rough idle once in a while. Do you think coolant temp sensor or oil cooler thermostat?
June 11, 2015
  Followup from the Pelican Staff: These are engine cooling fan fault codes. There may be an issue witht he electronic cooling fan. Can you run it through all the speeds using your scan tool? - Nick at Pelican Parts  
ryan Comments: Hi I have e91 318i 2006. Cooling Fan does not turn off unless I unplug connection. Stays on all the time even with engine off and keys out. New coolant temperature sensor fitted. Could this be a relay stuck? Thanks
June 5, 2015
  Followup from the Pelican Staff: There is not relay, it is part of the fan. The fan is likely faulty. - Nick at Pelican Parts  
hanson Comments: Hi it is a 2006 e91 318i. Thanks. How do I check dme?
June 4, 2015
  Followup from the Pelican Staff: Use a scan tool to see if the DME is commanding the fan ON. - Nick at Pelican Parts  
hanson Comments: Hi forgot to ask is there a relay for the radiator fan that could be style? Thanks.
June 4, 2015
  Followup from the Pelican Staff: Depends on the model. What vehicle do you have? - Nick at Pelican Parts  
hanson Comments: Hi cooling fan permanently on even with engine off and keys out. New temperature sensor been fitted with no change. Thanks
June 4, 2015
  Followup from the Pelican Staff: Is the DME commanding the fan on? I would assume it is a faulty cooling fan. - Nick at Pelican Parts  
whiteflash Comments: Hi.
I have an automatic 328xi, 2007.
My car had been overheating when idling or driving at very slow speeds. Once I hit 60km or higher there is no overheating issues. Also at high speeds the AC works great however after a few minutes of idling or driving at very slow speeds the AC kicks off.
Is this a cooling fan issues?
May 24, 2015
  Followup from the Pelican Staff: Sounds like the cooling fan is not working. - Nick at Pelican Parts  
Donny Comments: 2006 BMW 330i. The cooling fan randomly turns on. AC is turned off. From a cold start in the morning the fan will turn after driving for about 5 minutes. Sometimes it comes on as soon as you start the car. The coolant levels seemed good. No check engine light. Any suggestions? Thank you.
May 21, 2015
  Followup from the Pelican Staff: Sounds like a faulty cooling fan or sensor. I would use a BMW scan tool to monitor the cooling fan control when the problem is present. If the fan is ON and the DME did not command it ON, the fan itself is faulty. - Nick at Pelican Parts  
Rick Comments: 2007 335i twin turbo. Typically my oil temperature reading is 2-4 notches over the middle over 250F I think after the car warms up but the fan does not come on. Only when I turn the AC at full blast the fan comes on but at very low speed. I do not have a BMW scanner tool to measure the output voltage. Is there another way to test the fan to determine whether the high speed is working? Currently there are no fault codes but I have not seen the fan blowing at full speed.
May 17, 2015
  Followup from the Pelican Staff: You can disconnect the engine coolant temp sensor, the fan should run at high speed when the circuit is open. Keep in mind, this will set a fault code and you will have to clear it when complete. - Nick at Pelican Parts  
Hank Comments: Seems I need to remove my fan in order to access my serpentine belts better. As I have an oil cooler, and definitely in the way of my long ratchets. Ratchet won't "ratchet" without another hand in there, but no room from y experience.

Do I have to access the fan from underneath, or can I just do this from above, and pull up?

Thanks
April 18, 2015
  Followup from the Pelican Staff: What vehicle are you working on? On E90 models, the fan is removed from the top.- Nick at Pelican Parts  
vikter Comments: Hey guys, my model is 2007 328i N52N engine. I am currently trying to repair my radiator but now totally forgot how to put the ATF heat exchanger back into the cooling system. Is it originally connected with lower left corner of the cooling fan or somewhere else? Thanks!
April 14, 2015
  Followup from the Pelican Staff: If I remember correctly, it pushes onto the shroud, retained by a locking wire clip. - Nick at Pelican Parts  
335iAj Comments: 08 335i, currently my fan is working but low speed it seems. Heater works, but when you turn the ac on it does not cool properly. Once the ac is on, the fan spins at low speeds. Therefore not making the ac cooling. But does the fan need to be replaced or checked the fuses and it doesn't seem like those are an issue.
March 17, 2015
  Followup from the Pelican Staff: The fan should run on high with the a/c on and the vehicle stationary. Is that happening? If not, try commanding the fan on with a BMW scan tool to test the output stage. - Nick at Pelican Parts  
E91dude Comments: my fan is not working at all, already replaced the switch, how can I test that's it's actually the fan before paying the dealer $600?
February 25, 2015
  Followup from the Pelican Staff: You didn't mention what vehicle you are working on. On most vehicles, you can test it using a scan tool. You can also manually activate it on most vehicles using fused jumper wires. - Nick at Pelican Parts  
Arnuu Comments: What could be the issue, if my car's temperature when started cold raises very slowly, it takes about 30-40 minutes on cold car to get to 80 degress, but when driving, it gets to 110~ and it says it's overheating, but when i turn off the car and turn it back on - it immediately drops to 90 degress. Is it the sensor or something else? No codes from a computer. Plus, the fan is blowing like a hurricane even when the engine is at 85 degress. I changed the thermostat, don't know, whether the water pump should be changed. Should i start with changing the sensor or what?

Thank you for your reply in advance.
January 5, 2015
  Followup from the Pelican Staff: The first part of your issue sounds like a faulty thermostat. However, if the fan is on all the time, the engine may warm up slowly. If the engine is not actually overheating, you may have a faulty coolant temp sensor. I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing.
- Nick at Pelican Parts
 
Marius Comments: My car is a flood damage vehicle and i knew the motor to the fan got water to it so i replaced the fan and it still doesn't kick on. There is a fuse and a relay i need to check?? Where are those located and is there anything else like the sensor that could be the issue?
September 13, 2014
  Followup from the Pelican Staff: What type of vehicle are you working on?

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
 
Sipho Comments: Hi Guys , my car is a 2005 E90 ... the fan is always on as I start the engine. Any Idea how to fix this ?
September 2, 2014
  Followup from the Pelican Staff: You either have a faulty coolant temp sensor or cooling fan. Start by checking for fault codes. - Nick at Pelican Parts  
mustangspeed Comments: hello i am replacing my radiator on 2008 e90 coupe should i remove fan first?
July 16, 2014
  Followup from the Pelican Staff: Yes. Follow these instructions:
http://www.pelicanparts.com/BMW/techarticles/BMW-3-Series-E90/WATER-Cooling_Fan_Replacing/WATER-Cooling_Fan_Replacing.htm - Nick at Pelican Parts
 
Davidgr Comments: My car is 2006 e91 318i n46 engine. Fan part number is 17427563259.

Am i supposed to see anything between signal and ground with a DVOM?
June 6, 2014
  Followup from the Pelican Staff: I've never looked at it with a DVOM, usually a scope. I imagine there will be a steady voltage, in the middle of whatever the voltage is on the wire when the fan is commanded off. - Nick at Pelican Parts  
Davidgr Comments: Is it possible to measure with a volt-meter on the "signal wire" that there is a signal? My fan is not working but i can see 12,6volts on the "power wires".
June 5, 2014
  Followup from the Pelican Staff: Yes, the smaller wire will be a signal to activate the fan, I would suggest using a lab scope to test it, not a DVOM. You didn't mention your vehicle type or which fan, so I cannot look up the info. - Nick at Pelican Parts  
mohd Comments: hi
335i 2009

coolant engine temperature reaches 107 c withou ac and 95 with Ac... is it ok??

Is it still in normal range or it should be between 80 and 90 like other car brand..
December 6, 2013
  Followup from the Pelican Staff: How have you determined these temp readings? Most modern emission-controlled engines are designed to run at an operating temperature of 95°C, maybe slightly higher. I would start by checking the DME for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing. - Nick at Pelican Parts  

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