Question about 2009 GMC Sierra 1500

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My gmc sierra blows heat out of the defroster but not the dash vents. The A/C works fine.

The heat comes out of the windshield and window defrosters but not the main directable passenger vents. The cold AC through these vents works fine.

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  • 444 Answers

Control switch is probaly at falt.

Posted on Nov 02, 2012

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 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.

Posted on May 23, 2009

alicantecoli
  • 22095 Answers

SOURCE: a/c and heater only blow air out of defrost

either a vacumn pipe is broken or the ends split so its not passing a vacumn to open the flaps,where they are and how to get to them i cant help because i have never worked on one as they are not here in spain.check the engine end first though .Look for some small rubber pipes running from the inlet manifold

Posted on May 30, 2009

picatudo
  • 239 Answers

SOURCE: 2001 gmc jimmy defroster-heater blower will not direct heat

you have a vacuum leak

Posted on Jan 07, 2009

  • 8 Answers

SOURCE: no air, ac, heat out of in dash face vent

I changed my switch..on my dash...that controls the different settings. All settings work fine now.

Posted on Feb 03, 2009

  • 460 Answers

SOURCE: I replaced heater core in 1999 gmc sierra 1500 5.3

no,, the system works from a vacuum and has to be worked on in a service garage. sorry about the bad news...

Posted on Nov 12, 2009

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1 Answer

Heat not blowing out of windshield vent


Put the defroster on and move your temp setting towards warm and youll feel it come out of there. Heat doesn't come through those vents on normal heater setting those are the defroster vents.

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Have a 93 sierra,cannot get air to defroster,can hear fan but will not blow on windshield ?


Can you hear your blend door at all. Does it change into other settings. Like to floor and vents. It could be your blend door actuator.

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A/c and heater only blow air out of defrost


either a vacumn pipe is broken or the ends split so its not passing a vacumn to open the flaps,where they are and how to get to them i cant help because i have never worked on one as they are not here in spain.check the engine end first though .Look for some small rubber pipes running from the inlet manifold

May 30, 2009 | 2005 GMC Sierra 1500 Hybrid

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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

2 Answers

A/c and heater only blow air out of defrost


sounds like there is a vacuum leak, possibly under the hood.. Vaccumm is needed to change the mode doors.

Mar 30, 2009 | 2004 GMC Sierra 1500 Crew Cab

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Window defrost


it all has to do with vacums basically, when you turn the switch to defrost there is a hose that should **** a "door" so to speak over lettin the air travel through your defrost vents, and if your not gettin suction the in aint gonna switch over, and are you gettin it out of the floor vents?

Dec 22, 2008 | 1997 GMC Sierra

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