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BMW Coolant Expansion Tank Replacement
 
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Pelican Technical Article:

BMW Coolant Expansion Tank Replacement

Nick Czerula

Time:

2 hours2 hrs

Tab:

$200

Talent:

***

Tools:

Set of sockets, wrenches, 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:

Expansion tank, radiator hoses, engine coolant

Hot Tip:

Work with a cool engine.

Performance Gain:

Car will cool down again, coolant leak repaired

Complementary Modification:

Change radiator hoses, flush cooling system.

When a coolant expansion tank ages it becomes brittle and develops hairline cracks. You may have a coolant leak on the left side of the radiator or a catastrophic failure with a major coolant leak. Inspect your expansion tank every time you change your oil. Look for cracks or any signs of leaks. Ignoring a small crack is a bad idea as they can grow rapidly and create a major coolant leak before you know it.

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

Drain cooling system. See our tech article on cooling system draining and filling.

If your vehicle has a turbocharger, unclip vacuum hoses from expansion tank.

Working at coolant expansion tank, remove two 10mm fasteners.
Figure 1

Working at coolant expansion tank, remove two 10mm fasteners. (green arrows)

Working at top of coolant expansion tank; using a flatblade screwdriver, release upper hose retaining clip by prying up.
Figure 2

Working at top of coolant expansion tank; using a flatblade screwdriver, release upper hose retaining clip by prying up. (green arrow) Next, remove upper hose from coolant expansion by pulling straight off. You may have to wiggle the hose a bit to get it to move free. Be careful not to damage hose or tank, both are made of plastic.

Working at bottom of coolant expansion tank; using a flatblade screwdriver, release lower hose retaining clip by prying up.
Figure 3

Working at bottom of coolant expansion tank; using a flatblade screwdriver, release lower hose retaining clip by prying up. (green arrow) Then pull coolant hose off coolant expansion tank. You may have to wiggle the hose a bit to get it to move free. Be careful not to damage hose or tank, both are made of plastic.

Working at bottom of coolant expansion tank, disconnect electrical connector by pressing release tab and pulling off.
Figure 4

Working at bottom of coolant expansion tank, disconnect electrical connector by pressing release tab and pulling off. (green arrow) Once hoses and electrical connector are disconnected, lift coolant expansion tank up and remove from vehicle. Be ready to catch any extra coolant that may spill. With coolant tank removed from vehicle, transfer coolant level sensor over to new coolant tank. Rotate sensor 90° counterclockwise, then pull out of tank. Install in new tank and rotate 90° to lock in. When installing expansion tank, connect coolant level sensor electrical connector. Next, connect lower hose to expansion tank, the retaining clip is properly seated when an audible click is heard. Connect upper hose and engage retaining clips until an audible click is heard. Then install fasteners and reroute vacuum hoses if equipped. Fill and bleed cooling system. Once complete, double check all hose connections and check engine for coolant leaks.

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Comments and Suggestions:
Buck Comments: I have a 2011 335i turbo. the coolant leak appears to be coming from either the bottom hose or from the expansion tank where the hose connects to the tank. It only leaks after the engine is hot. What is my likely problem?
November 5, 2016
  Followup from the Pelican Staff: hard to say, could be the hose. The seals in the hose do fail. Best bet is to pressure test the cooling system to pinpoint the leak.

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
 
328 problems Comments: The upper expansion tank hose which consists of three hoses clamped together.. The middle one about as reliable as a straw blew on my vehicle. There's the easy disconnect at the tank, but then there is three of what looks like permanent clamps? Can they be disconnected and replaced? The hose comes complete3 pieces clamped together but the clamp on the far drivers side looks like one of the one time permanent clamps. How do I go about fixing it? Why can't I just get a piece of the middle tube and hook it back up instead of buying all three pieces.. Any help would be greatly appreciated
October 9, 2015
  Followup from the Pelican Staff: No, the hose has to be purchased as a unit with all the hoses attached. Unless there is a repair kit I do not know about. 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
 
Dee Comments: Help! Guy changed expansion tank and lost 2 of the 3 clips for hoses! Where do I find replacement clips?
July 10, 2015
  Followup from the Pelican Staff: If available, we can get them, if not available, you will need to buy new hoses.

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
 

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Page last updated: Fri 12/9/2016 02:23:07 AM