Question about 1994 Cadillac DeVille

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Hello, My 1992 Cadillac Seville has not been blowing heat for about one week. We replaced the thermostat and that did not work. Yesterday my car became really sluggish and started to overheat. The temperature was 260 degrees. I turned the car off and let it cool. We replaced the water pump today and the car still has no heat and the temperature is going up to 250 and then the fan turns on and it goes down to 200 again. PLEASE HELP!

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Help is HERE!
It looks like an Air lock scenario!
Park vehicle on level ground, when cold remove coolant filler cap, start engine and leave to idle, turn heater to hot blower on full. When at operating temp keep clear of coolant filler area and listen, hopefully gurgling then a boil over, wait and then top up with very warm water/coolant let settle it may boil over again whilst air is still in system.
Check for heat inside car, if hot and coolant settled replace cap but keep an eye on temp gauge for a while as air lock may still be further along cooling system.
Please press the Blue button if sorted!
Paul 'W' U.K.

Posted on Jan 28, 2009

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