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Old 02-01-2013, 11:26 AM
jtwrights jtwrights is offline
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Location: Chicago
Join Date: Jun 2009
Posts: 10
Mein Auto: 2005 BMW X3
Originally Posted by jdauria View Post
thermostat could be stuck open. 80k miles is getting up there in mileage and a cooling system overhaul may be in your near future. When you travel 40mph or so, there is enough air going through the radiator to keep the engine at normal operating temperature. But since its been super cold by you (-20*F yikes) the X3 is prone to extreme cold weather problems, at least from what I read and hear.

Did you check your coolant level? Check for leaks?
Coolant level is fine and I may have been unclear with the ambient temperature: it's been around 20 degrees F and when it goes below that temperature is when I'm having the problem.

And to reiterate, the engine is over cooling, NOT over heating; at least according to the temperature gauge in my car. My gut says thermostat but I just don't know enough to be sure.

Any ideas on cost to replace a thermostat? Is this a DIY project for a fairly handy (but generally car ignorant) person?
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