Question about 1997 Buick LeSabre

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Air conditioner blower

When we turn on our ac the air flow comes out the defrost and or the floor vents. Eventually sometimes it comes out the dash vents. IT doesnt seem to matter where the air flow control is set. Its hot outside please help

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  • jshipman Jul 29, 2008

    It happens all the time. It is a vacuum system and there is a vacuum air going to the system behind the glove box. with air flowing through it.

  • romero478 Aug 03, 2008

    My air conditioner vent is not suppling cold air just on the floors and through the defrost vents. What can I do?

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I found the vac lin broke under the battery

Posted on Dec 04, 2008

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Does this happen when you accelerate or all the time??, if you have a vacuum operated air distribution system the issue is a vacuum leak, if the AC is electronic then the air blend door motor is failing.

Posted on Jul 29, 2008

  • Marvin
    Marvin Jul 29, 2008

    You will need to check the engine compartment and check the the vacuum supply to the AC mode switch make sure it is not restricted or damaged, such as pinched, the line enters the car on the passenger side near the Blower housing

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Related Questions:

1 Answer

I have a 2000 SL1. There seems to be no air flow thru all the vents. When I turn the ac on, I feel something. When I turn on the heater in cold weather, I feel something. Confused. Help please!


Are ALL HVAC fan speeds operational when requested ??
With fan set on Hi,switch modes....Does the air flow come out the appropriate vents w/requested (Defrost,Dash center,Floor ????)

If you need further help, reach me via phone at https://www.6ya.com/expert/ralph_2f0886b7d6af32ce

May 01, 2015 | AC Cars & Trucks

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I have a 2011 Chevrolet Equinox LTZ and my question involves the heating/ AC unit. The air flow seems to be very strong through the Defroster but for the dash vents and the floor it seems to be much s


Defrost has been stronger on all types. Just the way plenums are made. Clear that wind shield first. As long as you have plenty of heat to keep the cabin area warm to hot, it's OK. I wouldn't woory about it.

Oct 05, 2014 | 2011 Chevrolet Equinox

2 Answers

Ac only comes out of defrost and floor vent, not dash


The ducts have dampers that work off of a vacuum and control the flow of air to the different air vents at the top, bottom and face of the dash. Sometimes the vacuum lines come loose or break. You'll need to look under the dash to see if any of these conditions exist.

Aug 15, 2013 | 1993 Chevrolet S-10

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Air regulator valve on dash for heat and AC stuck in on position. Ram 2500, 2004.


The most common problem is a stuck or faulty blend door under the dash.

Feb 22, 2013 | Cars & Trucks

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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

Air flow issue- intermittently blows from wrong vents


This is a common problem on this site.
In your case I would look for a vac leak or a sticky blend door.
Since the direction of air flow changes when you are accelerating, I'm going to guess the blend door or doors are controlled by engine vacuum. There may be a vac leak between the dash and the engine, or the blend door may not be able to move back and forth correctly.
Defrost is the default position when a problem occurs, to make sure the windshield is clear of fog or frost.

Jul 19, 2012 | 2005 Mazda Tribute

1 Answer

Have no heat in 1999 yukon. ac works. blower motor doesnt seem 2 blow as hard as it use 2


You could have leaves plugging the vent intake.
Of you could have a flap motor that is not working.
Have someone move the controls back and forth between defrost, AC, floor heat, etc., and watch the flaps under the dash. If the motor does not make a sound, it would be the switch, motor, or low speed resistors. But if it is turning, then it is probably the air flow.

Dec 21, 2010 | 1999 GMC Yukon

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Heat wont blow through heater or defroster vents


common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Jan 18, 2009 | 1997 Chevrolet K1500

1 Answer

Air doesnt come out of the vents


the linkage that runs the blend door isn't working, these are the doors that control hot and cold and air flow to dash floor ect...they are located in the air box behind the dash ................ you may be able to pull the heater controls out of the dash and spot the problem but it's likely that the problem is in the air box itself and removal of the entire dash is required (big job!!!!!!!!!).........if your vehicle uses vacuum to control this (some gms use vaccum and some a cable)you might have a hose disconnected under the hood by the heater fan.........if it's a cable it may be knocked off at the dash controls or at the other end on the heater box..........sometimes removal of the glove box will give you acess to this connection.
just checked and 88 s-10 is a cable
hope this helps..........thanks fro choosing FIX YA!

Jan 04, 2009 | 1988 Chevrolet S-10

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