I have a 1993 cadillac deville and the heat is not working properly it blows out air but cool air instead of hot

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Its possible you've installed the thermostat upside down. If this is not the case, then I think you've got an air bubble in your cooling system. It could work itself out or while the engine is cooled down, you can open the radiator cap and see if its at all low on coolant.

Check whether the heater core is clogged by feeling the two tubes at the firewall that lead to the heater core. If they are cool rather than hot when the car is at normal operating temperature, the heater core will have to be flushed out, or replaced.

If the two tubes at the firewall are hot, but the interior doesn't get heat, then a blend door problem may exist where it is at the wrong angle due to a faulty vacuum motor, or control for the vacuum motor.

Good luck on getting heat inside of your 1998 Cadillac Deville.

check to see if your hoses to heater core are hot on both sides. my 93 hoses where hot going in the heater core but not out. I flushed the heater core now I have heat

The blend door for the passenger side is not connected right or functioning correctly. Try seeing if the dial on the armrest on the passenger side is not rotated one way or the other too much.

check the heater control valve. sounds to me like the dash control unit that opens and closes the vents may not be functioning properly

Sounds like the doors on the heater exchange are not working or are partially blocked.

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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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.

if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

check you fan, or door controls under dash,
leroy