Question about 1996 Cadillac DeVille

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Air won't come out of vents, but will from defrost and floor.

If I want defrost on, it will work, the floor works too. The front vents do not work. If it's a vacuum where can it be found? Thanks. 96 Seville by the way.

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  • knowabit May 21, 2009

    Well thats no good. Maybe you can help me with this one...

    Ok, this happens it seems after the car has been running for a little bit, maybe ten or so miles down the road..Driving and I give it some gas and it only seems to slow down,(doesn't die) it doesn't rev up. Almost like a governor, I only slow down. The car doesn't seem to run hot, or no sulfur smell. It fires right up, every time. Put a new fuel filter in there hoping the problem would be as simple as that, but, nope.

  • knowabit May 21, 2009

    Well, I did, I put a new intake in there, reset it, haven't seen a light since. I'm hearing all sorts of things with this issue...faulty fuel pump, clogged fuel filter, catalytic converter...where does a guy start? Thanks.

  • knowabit May 22, 2009

    No, I dont have a code reader.

    As far as the air not coming from vents, it comes out of defrost no matter what I change it to, that means I dont have a vacuum problem...I just need the climate control module? Right? Thanks again.



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If it switches function even only a few then the problem is not the vacuum source (if u had no vacuum it would default to defrost mode) the problem is the dash control head vacuum mode control switch, i don't think u can just replace the switch, u have to buy the whole climate control module.

Posted on May 21, 2009

  • yadayada
    yadayada May 21, 2009

    The symptom u are describing may be a defective MAF (Mass Airflow) sensor, do u have a check engine light? the MAF will not usually set the check light.

  • yadayada
    yadayada May 21, 2009

    do u have engine codes? do u have a scanner that can reAD LIVE DATA STREAMS?



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