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      07-24-2010, 03:18 PM   #28
raceyBMW
king of the hills
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Drives: 335i coupe
Join Date: Dec 2006
Location: Denver, CO

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1994 530i  [4.25]
2007 335i Coupe  [4.07]
Usually thermostats just fail, but a lot of times they fail open which is good since at least you will not have overheating problems if that happens. The item that sucks when it fails is your water pump. Not much you can do about these to see if they failing other than just replacing as a preventative measure. However since they are so expensive on the E9x, I just don't see that happening too much probably.