Quote:
Originally Posted by Guillaume
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?
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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.