1996 Cadillac DeVille Logo
Posted on Dec 12, 2009
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My 1996 Cadillac Sedan Deville heater blows cool air and engine is running at normal temps. It never seems to get up to temperature.

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  • benrhoades Dec 12, 2009

    The car has been in the family since it was new and the heater core has not been bypassed. I'm not sure what temp of thermostat it has in it. Is there a door or vent that mixes the outside air with the heated air to adjust the temperature?

  • benrhoades Dec 12, 2009

    The car has been in the family since it was new and the heater core has not been bypassed. I'm not sure what temp of thermostat it has in it. Is there a door or vent that mixes the outside air with the heated air to adjust the temperature?

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  • Posted on Dec 12, 2009
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If you are not the original owner, the previous owner may have bypassed the heater core. The heater core is like a small radiator that has hot water running through it from your motor. It is inside of your dash board, near your a/c and heater controls. That is how yur car gets hot air. The air runs through the heater core making it hot. Bypassing it is a cheap and quick fix for a leaking heater core. When they get a leak, they leak all inside the car down to the floor board. Check under the hood along the fire wall. If it is bypassed, you will see two hoses spliced together. One will be bigger that the other slightly. If this is your problem, you are more thatn likely need to replace your heater core

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