Question about 1998 Cadillac DeVille

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A/c only blows thru defrost vent on 1998 deville,what could be the problem

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The heater control in the dash is probably bad.

Posted on Jul 15, 2009


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My ac does not blow thru the vents but up on the dash thur the defrost vent

Usually a sign of a blend door problem. The blend door or doors are controlled by the HVAC controller, either by small electric motors or vac.
If the system fails the default position is defrost for safety.
You'll need to check the power source for the blend doors and their operation. Usually when the system fails it sets a code in the computer.

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A/c not blowing 1998 deville

Could be the blower motor or the blower motor resistor. Take the blower motor out, power it and see if it works, if it does then replace the resistor.

Jun 21, 2012 | 1998 Cadillac DeVille

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The most likely cause would be a problem with the vaccuum source. Most vehicles use a vaccuum source from the engine, in order to control the Climate Control mode. The default setting is for the Climate Control is for it to return to the defrost mode when there is no vaccuum. I'll bet that there is a bad vaccuum hose is leaking or has become disconnected.

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1 Answer

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your a/c and heater blow thru the defrost ( top of dash? ) and the vents. Or defrost/or the vents.? and not on the floor? Well all of these should work. can you hear the motor inside the dash turning to they're perspective spots on the dial the motor pulls a cable and closes or opens appropriate doors as the selector switch is moved. if not the switch may be faulty. and you can get it from a parts store or dealership. CK the parts store's first they will be cheaper and will be able to give you a look at what needs to be done to replace it. But it can be done on most "fine " cars in 20- 30 min with minimal hand tools.

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If you have the heater directed to the windshield, the AC will turn on. Move the control away from defrost.

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