Coolant low
#1
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Got the coolant low warning a day or two after driving a hard hour at the track... Is this expected behavior? The engine was serviced at 20k miles and is at 44k miles now. I used to have to fill my Volvo up with coolant because of a warped head, ugh. My BMW is a 2007 550i.
#3
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Join Date: May 2010
Location: Bklyn, Ny
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My Ride: Navy 550I
Did you change the battery? Same thing happened to me and dealer said it was a battery fault!! Tech stated the coolant was a little low tho!!!!
#5
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My Ride: Soon to be 2006 530xi Silver on gray. Premium, Premium Sound, Sports(lite), Cold Weather pkgs, Navi
The coolant system is a closed system and therefore should NOT lose as a matter of normal operation.
#6
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My Ride: Orient blue '05 545i, Sport/Premium Pkg, 6Speed MT, Xenon, Navi, Blue2th, PDC,
I would say that you have a very small leak. When you push car harder on track the pressure in the system is higher causing bigger coolant loss.
Take the flashlight and look for blue\white coolant stain on the engine or bottom engine shield.
V8 has few common places of coolant leaks:
1. Temp sensor on the lower radiator hose (13621433077)
2. vent hoses (17127542540 and 17127534917)
3. Valley pan (11147507278)
http://realoem.com/bmw/showparts.do?...51&hg=11&fg=10
4. Water pump
5. Small crack in the expansion tank (17137542986)
See the diagram
http://realoem.com/bmw/showparts.do?...86&hg=17&fg=05
#7
the 535i has a motor that has been known for unreliability. to me, it was a 2006-2007 version of the 530i or a 550i. so if you're dead set on only considering the 535i or a MB, i would go with the MB. side note, C class is real small. more comparable to a bimmer 3 series than a 5 series. the E series of MB is closer in comparison to the bimmer 5 series. just fyi.
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