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Posted on Jan 02, 2017
HVAC control head problem or it is the air Temp Control Valve problem. THe control head is the one with the buttons and knobs and the control vavle is located on the HVAC carrier assembly underneath dashboard (two of them one on left and one on right in center). This is a job for someone who has knowledge of HVAC and electrical on a GM vehicle.
Posted on Aug 02, 2009
I recently had the same problem with my 04 Silverado 2500HD after I replaced the battery. I am guessing that you have dual climate contol. You need to reset the climate control. I reset mine by simply shutting the AC off when truck is running and parked. Then turn off the truck
and pull the AC and HVAC fuses out of the fuse box. Leave them out a few seconds and put them back in. Start the vehicle and leave the AC off for about a minute, then turn it on. This should fix the problem. If not, try it again. If still not, you might have to do the same thing except unhook the battery at the same time you pull the fuses. Good luck.
It worked for me.
Posted on Aug 06, 2009
My 04 tahoe had to have the a/c door actuator replaced as well, same problem. 100.00 part from dealer if you want to do it yourself.
Posted on Dec 05, 2009
Remove the 5 mounting screws from the instrument cluster trim plate and remove the trim plate. Remove the 4 mounting screws from the instrument panel face plate and remove the face plate.Remove the instrument light grid from the center of the cluster. From behind the instrument cluster reach behind the speedometer and disconnect the speedometer cable by releasing the tab. Pull the cluster forward just enough to detach the "check engine" light bulb from the center of the cluster. Remove the instrument cluster from the dashboard.
Posted on Jan 13, 2010
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