Question about 2003 Cadillac Deville

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Top vents do not work while air conditioning is on work good on floor

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  • 483 Answers

Hi,
It sound like it’s one of two things ;
1. It could be the function control knob on the dash is no good or that the vent/ def. door control motor is no good possibly seized up.
2. Secondly the thong that I would suspect is that the door itself is jammed in the on spot.
Please let us know for future assistance.
Thanks
Fame !

Posted on Jul 13, 2009

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Posted on Jan 02, 2017

SOURCE: 2004 Ford Crown Victoria no air flow through main air vents

Chances are the electronic/digital HVAC control unit is bad. This same problem happened to me and I had to replace the entire unit. The dealer wanted to charge $800 for just the part! After I freaked out on them, they found a used one for less than half. Sorry, but there's no easy fix here.

Posted on Jul 19, 2008

kimberlator
  • 28 Answers

SOURCE: air conditioning

Check for a broken or loose vacuum hose under the hood also........




Good luck........

Posted on Aug 15, 2008

  • 1 Answer

SOURCE: I have a 99 Buick LeSabre with the same problem.

for my 1975 buick lesabre it was a vacume hose that conected to the fire wall i also learned that behind the clove box theier are two control arms one on top one on the bottom i believe the top controled hot and cold the bottom controled driver and pass ie left vents or right vents thank you ifixed mine hope the same 4 u

Posted on Jul 15, 2009

  • 432 Answers

SOURCE: All Air Conditioning blows our the defrost vents

Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.

Posted on Oct 06, 2009

  • 162 Answers

SOURCE: blowes air throught defrost vents only

its a problem with the switching mechanism. you have to look up under the dash to see if you can see where the switching mechanism is. if you can not see it from there youll have to remove complete center dash

Posted on Apr 04, 2010

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