Question about 1996 Cadillac DeVille
Air Cond. was all replaced two years ago,(pump,condensor, hoses,)also Radiator, Blower last year. Controls seem to be working,they change from heat to vent to defrost.These repairs were not done because of this problem,this is a recent problem.If this was an older car I would say the Heater ,water valve, was not opening all the way. I know there is an air blend door. the lever I see looking up under glovebox from the floor on the passenger side moves. Would I get some kind of codes, and if not, could the heater core be only partially plugged?
THERE IS A RELAY CONNECTOR THAT GOES TO THE BLOWER AND THAT CAN BE REPLACE AND THAT WILL PICK UP ALL 1234 SPEEDS THEY ALWAYS TEND TO GO OUT IN TIME
Posted on Jan 15, 2013
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Posted on Jan 02, 2017
Sounds like a Blend door issue, but could be the controller switch, Test ALL modes of operation to see what works and what does not. That should narrow it down a bit. The Blend doors are flap/ doors that regulate air flow, newer vehicles are plastic - electric assemblies ...prone to failure. Any clicking or thumping noises during switching modes and on-off suggest a bad Blend door. Hope that helps...good luck
Posted on Jan 12, 2009
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.
Since you state the 2 things you ruled out, that leaves only the water pump. Is the car running hot? The thermostat may be sticking as well... but im leaning toward the pump.
Posted on Jan 21, 2009
heater radiator blocked or partially blocked,drain antifreeze and save ,remove the inlet and outlet pipes for teh heater and flush in both directions repeatedly .brown rust should come out,if not a lot comes out then fit two pieces of pipe about a foot long to heater unit pipes and mix some caustic soda and pour in one pipe with a funnel till it comes up in other pipe leave for a while then flush again and you might need to repeat this two or three times
Posted on Dec 16, 2008
those have a part called the programmer that controlls heater a/c function its most likely the cause.. it located unter the heater box on pass side
Posted on Feb 04, 2009
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