Question about 1999 Cadillac DeVille

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AC blows through defrost and floor vents instead of ac vents

2003 chevy astro, the ac only blows out defrost vents no matter what the switch is set to. No wonder chevy is bankrupt, I've had the same problem with Chevy's since 1988, how about improving the product!

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You have a vacuum leak in the system that controls the vent doors. First check for cracks at the vacuum reservoir, then check the various vacuum hoses and vacuum motors for a leak.
Charlie

Posted on Jun 19, 2009

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1 Answer

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These will help.

Thanks.

Nov 28, 2012 | Cars & Trucks

1 Answer

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


I think your problem is the head unit that selects where the air comes out ie. Face, floor, defrost, or hi-level face and floor. If that's not working then it will not let you switch location that you want the air to come out.

Jul 26, 2012 | 2003 Chevrolet Tahoe

1 Answer

Fan blowing warm air only, and only through the defrost vents


Had the problem been solved after you replaced the damper door switch and had the gas checked in the ac system??

_________________
ak90 programmer

Jun 27, 2012 | 2003 Ford Taurus

1 Answer

Ac does not switch from defrost to ac it stay on the defrost vent does not go to ac vents air coming out defrost vent


There is a vacuum hose that runs in front of the throttle body going to the vacuum ball the hose is part plastic they get hot and break.With out this hose attached the blend door actuators will not move.

Aug 04, 2009 | 2003 Chevrolet Astro

1 Answer

2003 envoy ac blows cold from defrost and floor but will not dash


u have to take your dashboard at the glove compartment to cheack the vacuumpod ot your damper door

Jun 27, 2009 | 2003 GMC Envoy

1 Answer

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Does it still blow out the floor and defrost when you set the switch to those positions or does it alway blow out the defrost no matter what? If you can get air to blow out to the floor, then it sounds like you lost the switch that controls the airflow to the vents. If it only blows out the defrost, then you probably lost the vacuum to all of the switches. When the vacuum is lost, it will only blow out the defrost. Check the smallest line on the vacuum distribution block located in the corner near the brake master cyclinder. That line provides the vacuum to control the direction of airflow within the cabin.

Jun 08, 2009 | 1996 Ford Mustang

3 Answers

AIR FLOW STUCK IN DEFORST VENT WILL NOT SWITCH TO FLOOR OR AC VEN


I found a broken vacuum hose on top of the intake which runs the controls

May 07, 2009 | 2000 Chevrolet Astro

1 Answer

WILL NOT SWITCH AIR FLOW STUCK IN DEFORST VENT


when your car is in defrost it has an ac cycling it removes the moisture then sends the air over the heater core depending on how warm you set it you can feel warm or cold but the ac is always cycling...ridding the moisture...you need a good ac tech it will be okay...its just expensive going into the heater core if needed...!

May 07, 2009 | 2000 Chevrolet Astro

1 Answer

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You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.

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1 Answer

2003 dodge caravan air vents will not change position?


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