Mechanics

THERMISTAT

1999 Cadillac SLS

Engine Cooling problem
1999 Cadillac SLS V8 Front Wheel Drive Automatic 70000 miles

replaced theristat still over heating at low idle will cool at higher idle
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Hothead
December 1, 2009.



It doesn't seem right that it will overheat at low idle only. Speed equals increased heat, and it should overheat more, and faster with engine speed. I would still suggest a block test for leaking internally.

Factoryjack
Dec 1, 2009.