Question about 1990 GMC Sierra
Blend door malfunction. check for a broken door, or bad door actuator.
Posted on Oct 26, 2012
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Posted on Jan 02, 2017
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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