Question about 1997 Chevrolet Monte Carlo

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The a/c blows out the defrost vent and the floor vent and that's it. Any suggestions on what is causing this?

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Check for vacum leak under hood small plastic line

Posted on Jun 24, 2009

  • davidworley Jun 24, 2009

    check for vacum leak under hood small plastic line

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1 Answer

Blows hot air on the floor but cold in the defrost


most likely leak in one or more of the vacuum lines and or out door air damper not closing

Feb 27, 2015 | 2013 GMC Acadia

1 Answer

2004 trailblazer dash vents fail to blow heat. All other vents work normally. I could not locate a vacuum hose that I thought might operate the upper dash vents. what do you suggest? Thank you.


this vehicle has electronic acuators that move the doors and do not use vacuum. the mode door actuator is bad causing this problem. there is a defrost acuator that works the defrost position and a mode door that works floor/vent operation. the defrost moves and diverts airflow up defrost vwents this is why you can still have defrost and floor.

Mar 09, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

My ac only blows from defrost and floor vents.nothing blows from the front vents.


Look for vacuum leaks. System is designed to fail in defrost mode. so.... vac hose off, for example, would cause an issue like you describe.

Jun 30, 2010 | 2004 Chevrolet TrailBlazer

2 Answers

My 1997 C1500 Chevy vent issue


Your blend door is probibly not moving all the way to vent position.If you put it on vent there is probibly air blowing on floor or defrost.It may also be opening just a fraction and causing back pressure on the blower motor causing the noise.Is there any difference in outside air or recirculate?

Mar 09, 2010 | 1997 Chevrolet C1500

1 Answer

Defrost blows constantly? How do i fix it?


does it blow through the defrost vent only when you switch to vent/floor or does it blow through defrost and vent/floor? is it a switch that is just electric or a manual lever that you slide? the manual type will have that problem if the diverter or the linkage behind the lever(in the dash behind the panel......may be able to access underneath) becomes broken or disconnected so that the air is diverted to defrost regardless where you move it.if you can get to it, you will see what is broken or maybe a fastenerr fell off.

Feb 13, 2010 | 1994 Chevrolet C1500

1 Answer

Dash vents will not blow air. Defroster and floor vents blow fine.


Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.

May 23, 2009 | 2004 GMC Envoy

1 Answer

Auto climate controll only blows through defrost & floor,not the


it either has a vacuum line on the back of the unit off or the control unit is bad

Mar 19, 2009 | 2005 Ford Crown Victoria

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Air will not blow out of panel vents


vents are blocked so air is diverted to other vents, check and clean if necessary

Aug 02, 2008 | 1994 Buick LeSabre

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