Question about 2002 GMC Sierra 1500
Sounds like you probably have a bad vacuum line on the back of the heater control. If you remove the heater control from the dash, you will find a vacuum hose cluster attached, you may either have a vacuum line that has come loose or one that has a hole in it. If you don't find either of these problems, then you may have a bad heater control, but I would look for a bad vacuum line first.
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Posted on Jan 02, 2017
the resister block needs changing... oddly enough i'm unsure of what fan you are saying is not working.... if it's the front.. the resister block is located on the duct work under the dash for the air... near the fan... you will see a connector going into the side of the duct work. two screws and the block comes out... should be fairly obvious for the rear one but it will be near the fan.
Posted on Apr 16, 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
your heat/cool and vent selection options are controlled by engine vacuum through small clear tubes attached to the rear of your climate control interface. Other vehicles have small steel pull wires that operate the desired changes. You might try removing the trim and any fasteners affiliated with the interface/console. GENTLY pull outward and look to see if any of these tubes are pulled off or cut/damaged. Did anyone recently install a new stereo in the vehicle? If so, the vacuum tubing and or pull wires that change your outlets could have been damaged when the stereo unit was pushed into place. Hope this helps
Posted on Sep 09, 2009
Testimonial: "Very good information. THANKS!"
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