Question about 1992 Cadillac DeVille
I can not get the heat to work It blow air but no heat
I have a 92 Deville. All the flushing in the world will not fix the cloged up heater core. The flush will clean out the passenger side of the core but will not clean the core on the drivers side. I have just repaced my core and seen how these fail, It is a bad design that caddys are known for. It was recomended I do a total flush of the system every 30,000 and then just maybe I would not have to endure the core change again. As the antifreeze runs through the car it does a chemical change due to all the different metals and rubber it flows through. since the heater core is small with small bands to let the coolant in and out, it builds up with the sludge from the chemical change. Thus closing off the drivers side first. Note, both the inlet and outlet are on the passenger side, you really cant flush fluid where it builds up the sludge in the core. Solution, new core after trying a flush
Posted on Feb 07, 2009
First of all flush the system. and remember to back flush as well ,and dont break the plastic T while removing it reinstall and you will have, have a great day
Posted on Jan 12, 2009
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Posted on Jan 02, 2017
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.
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Posted on Jan 22, 2009
There's a blower motor (fan) under the hood and up against the firewall near the center of the car that takes some work to remove. It has gone out in the last 2 of my 4 Cadillacs. Turns out if you're not real careful with the positioning of the spark plug wires they will brush up against it, and if one of them gets cracked or brittle it will "arc" and short out the blower motor. The a/c compressor should still come on (you'll hear a click when it engages) but you won't get any air blowing into the cabin, hot or cold.
The part was like $200 stock (year 2000 prices) and it took about an hour to remove it. My Caddy at that time had this damn strut bar going across the engine bay which we eventually removed to get to the blower motor.
Posted on Apr 09, 2009
SOURCE: 1991 cadillac deville NO HEAT
I had the same problem in my 1991 caddy, and turned out to be the blend door. It is located in back of the glove compartment. There are two kinds, the automatic blend doors and the manuel ones. Since the temperature is automatic and programmed to stay where it is set, it would be an "automatic blend door". Not a hard fix...
Posted on Jan 25, 2011
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