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Pat S Pat S is offline
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Join Date: Apr 2003
Location: Tampa FL
Posts: 798
Oil Thermostats can go bad and can leak out of the top if they are the adjustable kind. Not common but can happen. I'm not sure how to check the leak part other than looking at it, but if you want to check its functionality do a search, there is a thread on how to test them in boiling water. It's easy especially when the engine is out.

Current: 07 S4 Avant, 06 Volvo S60R
Sold: '74 911, 01 986, 93 Volvo 240
Old 08-12-2004, 06:38 AM
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