1996 Cadillac Deville No Heat ?

  • Thread starter Thread starter dhage86
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dhage86

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1996 cadillac deville... Coolant levels are good... Worked fine one night and the next day it blew ice cold. Is it more likely the thermostat or else the heater core being shot or plugged? How can i tell if i thermostat is bad when i take it out?
 
check to see if its stuck open or closed, or if it is super stiff to move, that will tell you if its the thermostat, you can also back flush the heater core, engine block and radiator, and if none of these work, replace the water pump......this should take care of all your problems in your heating and cooling
 
you can check thermostat by cranking motor and removing radiator cap and watching flow of coolant if it dont drop and rise its stuck shut if it just keeps flowing its stuck open and will take forever to get warm you can also feel heater hoses if one hose is hot and the other cold and really if your going to remove it buy a new one and replace it only a few bucks but you can put it in boiling water and if it opens its working
 
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