Question about 2001 Cadillac DeVille

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Ac vents on dashboard not blowing cool air out. knocking sound preceded problem.

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There is a air diverter box down on the right side under the dash.This most of the time is the problem.If you have air exchange at other areas and not at the vents this is most likely the problem.

Posted on Jul 23, 2009

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1 Answer

AC is only blowing through the defrost vents in the dashboard?


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Maybe your dashboard vents are clogged, obstructed or stuck in close position somehow.

If not, check the air hoses that carry the cooled air to the main vents are not clogged, bent, ripped or simply detached.
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We have a 1998 cadillac deville and sometimes the ac will blow through the vents normally and then unexpectdly they will start to blow air through the vents ontop of the dashboard. Also, when the coolent...


When the cool air ceases, does any air blow? If your air flow ceases (the cooling fans run the entire time the A/C runs normally), your cooling fans might also be malfunctioning. How many times has your car overheated since the September 2008 head gasket replacement? Repeated overheating will dramaticly shorten the lifespan of a head gasket (if you and/or your husband know your way around cars, the head gasket replacement isn't terribly difficult, just takes ALOT of time- you can send an email to maintjoseph @yahoo.com -no space between the name and the @ sign- and I'll help guide you through the head gasket replacement). I had to replace both gaskets and a head on my 1999 Taurus with a Vulcan engine and have had continuing problems with the cooling system. Your computer might also be acting up if you're noticing other driveablility problems.

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1 Answer

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u need to check the vacuum from the engine to the ac control head, the air defaults to the defrost when the system looses vacuum from the engine, this is for safety.

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1 Answer

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