Question about 2008 GMC Envoy SLE-1
Posted by Anonymous on
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Posted on Jan 02, 2017
the vent channels behind your dash is where the problem lies. It mostly depends on you and your skill. You are going to have to get help also because the dash lifts up and rolls back twards the driver and passanger seats. what you have to do is first check the cable or vacume assembly that operates the vent controlls, make sure nothing is disconnected or broken. If all the cables are in place and move correctly and the vacume hoses have all been pulled off and checked for crackes wholes and functionallitgy. then start checking the seals and vents that route the air flow. find the one that goes to the driver side make it move with your hands then see where the movement comes from also check the seals if they are broken or have come off and are just not allowing air to be channeled to that location. Also make sure that if the control pannel in the dash board is good. Usually if its electric and bad there is a specific smell you will get from burnt electrical boards or components.
Taking a dash off is not the easiest work in the world, and you have to remember wheere every single screw, bolt, nut and clip goes. If you forget one single thing the dash could ratle squeak or do something that will totaly drive You INSANE for the rest of your life. I am not trying to say don't do it, I love DIY'ers but think about if your ready for this. Is your skill where it needs to be and do you have the tools needed for this task. Also, I would buy a Chilton, it will have ilistrated pictures and special notes. I hate saying this also but read the entire procedure first before starting I once took the entire dash off of a chevy blazer to replace the heater core just to find out I had to cut a molded plasitc shield under the hood. Had to put the entire dash back together without replacing the heater core because I didn't have a cutting device for the plastic shield.
Hope this helps
Posted on May 01, 2009
need to go to dealer to have HVAC module reprogramed. whenever diconnecting battery power on these vehicles you can connect a 9 volt battery between neg and pos to keep the memory in the computers. I am an master ase technician and 5 classes from gm world class tech.
Posted on Jul 31, 2010
Replace the door blend actuator behind glove box, approx $150 for part, Everyone I know with dual control on the silverado's have this problem.
Posted on Dec 27, 2010
Tips for a great answer:
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To troubleshoot this types of problem,click the link below
--------Go through the procedure to confirm the issue.
Engine Overheats and heater blowing cold?
Heat blows cold on drivers side and hot on passenger side?
This will help.Thanks.
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