Question about 1992 Cadillac DeVille

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1995 cadillac deville 4.9 eng no heat

1995 cadille deville 4.9 eng.
my heat don't get hot it blow out cold air from the defrost and the floor panel.

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  • lonniejon2 Jan 22, 2009

    also in the radiator it looks like its got rust in it will this be the cause of no heat.

  • lonniejon2 Jan 22, 2009

    ok so u saying flush it twice if i still have the problem replace the heatercore. i will try this in the tomorrow.

  • Anonymous Jan 25, 2009

    i done a complete flush and my car started get hot air.now its not get hot air nomore it take a long time for it to come out it blow cold then a little warm then back to cold plus now it has a throttle sound.

  • Anonymous Mar 05, 2009

    i have a 1992 casillac diville 4.9 motor the heat only gets warm, water is full hoses are hot, air gets hot once in awhile. this car has 65,000 miles on it.

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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.

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Posted on Jan 22, 2009

  • blueextc3221
    blueextc3221 Jan 22, 2009

    definately, that is part of the sludge build up i mentioned above. Have it flushed at least 2x. if there still is a restriction, heater core needs to be replaced.

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