HVAC system in my 2004 GMC Sierra (digital duel climate control) was not working properly, mainly having problems with recirc button for fresh air intake, door would not close. Ordered new actuator and took to shop to have replaced.

Shop put on computer and found a code for HVAC system, while they were checking on the code they found out there was a program update for HVAC system. Downloaded update into truck and works fine now.

The HVAC system on these trucks have there own program, and GM has updated the program for the system. If you are having any problems with yours might want to check for program updates.

 

dumb question..was it clicking and wouldnt open or close...mine is stuck on the vents..wont go to defrost..think that will fix my problem

 

how much did that cost you? mine is doing the same exact thing as yours. i have dual climate control also.

thanks

 

Mine just won't blow as hard or as cold as my cousin's 06. I know the efans have something to do with it, but there is major differences.

 

Wow, cool deal Matt...funny how it worked for so long, then just quit, and a reflash of the BCM fixed the issue. Glad that you got it worked out

 

Cost me 82.00 for update at local shop.

Thanks to all who helped me out on this problem!!!!! PT.net RULES!!!

 

im assuming local gm dealer shop? thanks

 

Not gm dealer, just local mech. shop. When they hooked up to computer it showed a code for the HVAC, then upon checking on they found the update. It also fixed the blend doors, driver a/c was not blowing as cold as passenger.

 

another question for ya... do you know what kind of scan tool they used? i have access to a snap on scanner, and a genysis.

 

I believe it is GM specific, is it not?