Question about 2005 GMC Sierra 1500 Hybrid

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A/c and heater only blow air out of defrost

I have a 2004 gmc sierra ext. cab 4x4 and air or heat will only come out of defrost. wont blow out vents or feet. my defroster is stuck blowing on vent and will not switch over to heat on the floor or defrost

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  • Bryan
    Bryan Jan 01, 2014

    1999 GMC Sierra in Canada 53 below zero I started truck turned knob to blow on defrost is stuck on vents will not switch at all.

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  • GMC Master
  • 22,095 Answers

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

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cadman000
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SOURCE: 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.

Posted on Mar 30, 2009

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