Mechanics

CADILLAC SLS RADIATOR PROBLEM

1998 Cadillac SLS • 138,767 miles

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?
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Daridym11
March 21, 2013.



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.

Caradiodoc
Mar 21, 2013.