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Old 04-11-2013, 12:14 PM   #16
johhnc479
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Join Date: Oct 2012
Drives: White FRS, 2011 Cayman, 1986 944
Location: Damascus, MD
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Quote:
Originally Posted by Guillaume View Post
I observed just that while stuck in traffic this morning...

Water temp would go up until approx. 212F, then start falling quickly to the "normal" 194F. It then starts to climb up again and the cycle continues.

Is it some sort of cooling issue or just poor regulation?
On my 944, (the only car I have where the factory gives you a real temp gauge) the gauge goes up when idling until fan comes on, then back down. I wouldn't say it "cycles" though. Fan usually stays on until I'm back up to speed. Don't typically spend much time in heavy traffic in that car though.
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