Old Timer - New Member

[chieffan]

Hi all. I have been a Chevy owner for many years. Now retired and living in SW Iowa and drive an 04 Avalanche. Been a real good truck, purchased used and have put about 40K miles on it. Serviced by the computer and use Quaker State Hi Mileage oil. Only gets about 8-9K miles a year, mostly local driving. A while back I was going to an auction and the drivers side went from A/C cool to heat. About a week later it corrected itself and worked good for several drives. Then suddenly the passenger side went to full heat with no control over it. Driver side stayed controllable. Tried a couple different reset procedures that didn't work. Had to put in a new battery and that didn't change anything. Right now I went out and turned the key on and the temp controls (2 sliders) to the center position. Then removed HVAC fuse under the hood and turned the key off. Will leave it that way till we get ready to leave later this afternoon and see what happens. A lot of posts reference to the blend door actuator and hearing a clicking from under the dash. I nor the Mrs has ever heard any clicking sound. Had it checked by a former Chevy mechanic that owns his own repair business a couple days ago. Was told it would be $751 to fix as it was the top actuator motor that was bad. I don't have $751 to throw at that truck with winter coming on and would not be ready to do so even if I had the $$$. I think I am going to attempt to fix this myself. I know my way around the shop with wrenches and have worked on most of my own vehicles my whole life. Any suggestions as to a good service manual for doing this project?

[txab]

Welcome

[Daryl LBZ]

Welcome!

[slj2008]

welcome

[chieffan]

UPDATE: So far the AC/ Heater is working like it is supposed to. Varied the fan from off to speed 3 a couple times. Changed the temp slides to warmer and down to cool. Started the truck several times during our 75 mile trip to another town and at various stops in that town. Was getting cool when we left dinner and headed home so run a little heat. So far so good. Have every limb and finger crossed that I can cross and hope it keeps working. Looks like thos systems have their own temperament and have one way to correct them and is a little different for each one. Makes it hard to stay ahead of them.