Question about 2004 GMC Sierra
Sounds like the blend door. The actuator motor is located on top of the box (behind the glove box) and is notorious for failing.
Posted on Oct 26, 2012
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Posted on Jan 02, 2017
the blower is on a different fuse than the heat deforst one if the resistor is faulty the fan would run on speed 5 only so still could be fuse or motor check for power to main motor under glove box ??
Posted on Feb 04, 2009
SOURCE: 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?
Posted on Feb 11, 2009
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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