1998 Cadillac Sls Car Runing Hot Changed Anitifreeze Replaced Thermosthat S

1998 CADILLAC SLS
138,767 MILES
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DARIDYM11
  • MEMBER
  • 1 POST
the car is runing hot. i changed the anitifreeze, and replaced the thermosthat . It's not leaking out the bottom of the the car which rules out a bad waterpump. what eles can it be?
Mar 21, 2013 at 9:21 AM
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CARADIODOC
  • ✓Experienced Mechanic
  • 34,407 POSTS
I don't have a listing for an SLS. If this is a front-wheel-drive model, check that the electric radiator fan is turning on. If it is, a common suspect is a leaking cylinder head gasket. Combustion gases can pool under the thermostat causing it to not open. The radiator hoses will not be real hot.

If the hoses are hot and the heater blows hot air, check the radiator for cold spots indicating some cooling tubes are plugged, and check if the cooling fins are rotten and crumbling away. The clue there is the temperature will come down when you run the heater on high.
Mar 21, 2013 at 11:38 AM
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