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Old 12-14-2010, 02:36 AM   #6
Bimmer Heaven
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Join Date: Feb 2002
Location: Ontario
Posts: 15,635
Why not just replace the thermostat and see what happens! It's not a milion dollar item, and pretty good to do if you dont have any records of when it was replaced.

The cheap way of testing it will be to take the Tstat out, and run the system without it. If problem goes away, then you know what was wrong!

The other way of testing (without running the car) is placing the Tstat in boiling water (or heat up with a torche) and see if it opens, or stays closed (stuck!)...
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