Jump to content

2008 HVAC Question

RGreco77

Recommended Posts

RGreco77 Enthusiast

RGreco77

Posted
Posted

2008 SIERRA DENALI -

 

Question - when I put press the AUTO button on the A/C Heat controls the snowflake button lights up even if the temp is set at a warm temp - is that normal?

 

Also trying to find out how I would know if any of the door actuators are broken?

intheburbs Enthusiast

intheburbs

Posted
Posted

Both my Denali and my Suburban do the A/C light when I hit "Auto," so, yeah, I'd say that's normal.

 

If the doors lock and unlock properly when you use the power locks or remote, they're working. When I bought my Denali, the rear driver's side door wouldn't unlock. I bought a new actuator off Amazon and replaced it myself. Mildly irrititating, and it helps if you have smallish hands. Probably took me 30 minutes, and I'm quite the expert at removing the door panels.

RGreco77 Enthusiast

RGreco77

Posted
  • Author
Posted

I did mean the actuators in the HVAC system.

 

It seems that sometimes the Left side (drivers side) blows cooler air when the heat is on and warmer air when the A/C is on, i thought I had fixed this when I replaced the HVAC contols but I think i still have issues.

GhostWriter Enthusiast

GhostWriter

Posted
Posted

I did mean the actuators in the HVAC system.

 

It seems that sometimes the Left side (drivers side) blows cooler air when the heat is on and warmer air when the A/C is on, i thought I had fixed this when I replaced the HVAC contols but I think i still have issues.

Bought my '08 Avalanche in 2012. Wasn't completely satisfied with the cooling, so I did some research.

 

Found out there was a fix that involved re-programming the HVAC system. I paid a fee to have the computer re-flashed. Seemed to improve, after that.

 

Wish I could tell you exactly what the symptoms were. It was too long, ago.

 

A dealer or another enthusiast may be able to help. They would probably ask how long you owned the vehicle, & when the problem started. Here's something: GM HVAC Actuator Recalibration

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.6k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    343,007
    Total Members
    8,960
    Most Online
    Brendan C
    Newest Member
    Brendan C
    Joined

  • Who's Online   2 Members, 0 Anonymous, 1,025 Guests (See full list)

  • Latest Articles

  • Posts

    • richard wysong
      Electrical Problem - solved

      By richard wysong · Posted

      Thanks for posting, I'm sure it will help someone
    • Brendan C
      2026 6.6 L5P oil cooler leaking oil at 4,000 miles

      By Brendan C · Posted

      New to diesel trucks. I happened to find my oil cooler leaking oil externally with only 4,000 miles on the truck. I didn’t realize this was an issue until I started researching it. Dealer is going to replace it under warranty but I’m wondering if there’s anything GM is working on to fix this issue. I’ve heard the oil filter used is the same as they use on their V6 motors and that’s what is causing the problems. Should I switch to a bigger filter or keep using the OEM recommended? 
    • Vu1can
      Seems to be Missing a lot of Updates

      By Vu1can · Posted

      So, GMCustomerService:  Judging by the Update History pictured above, is this truck missing any updates that it actually needs. If it's just for the infotainment system, the radio is working fine and no trouble with SeriusXM. and Android Auto is working fine wirelessly with my phone. Some months ago, an update notice was sent to my truck. I approved the update and it finished saying that the update was successful, but it seems that whatever that update was, it didn't actually get installed - at least not if I'm to go by the Update History shown above.   So, again, are there any updates that this truck really should have? I've checked with my dealer but they're reluctant or commit to anything and if I want them to check, they require a $200.00 fee just to check it out and then I'd have to pay for the actual update(s).    Ignorance is bliss, and if none of the updates goes to fixing any mechanical discrepancies, I'll just leave things as is.  
    • CNH-320
      Electrical Problem - solved

      By CNH-320 · Posted

      Hey everyone, I recently had an issue with my 07 2500HD GMT900. My DRL’s stay on at all times. Right front turn and right mirror turn signal indicator stay on solid at all times. By “at all times” I mean the only way to make them go off is disconnecting the battery. I tore the headlight assemblies out, tried disconnecting the harnesses to eliminate bad wiring at the harness, I unplugged the headlight switch, no change and the mirror turn signal still stayed on. My first thoughts were : Bad bulb and/or socket somewhere, under hood fuse panel bad, bcm bad, tail light or trailer wiring problem, or some random short to power in the harness.  Possibly a bad ground but unlikely. I had a big clue in the fuse panel, it had a burnt smell. I started pulling every fuse that had to do with DRL or right turn/park lamp. Nothing made the right directional turn off but pulling the DRL2 fuse made the DRL’s go out.  After studying wiring diagrams, I found that both problems had that fuse panel in common, the bcm also controls both problems but knowing the fuse panel had a burnt smell I removed and disassembled the fuse panel and found a little corrosion on the printed circuit board.  I ordered a new fuse panel from Amazon for like $260. When it arrived I installed it, and put everything back together, the problem was fixed. I figured the fuse panel needed to be replaced anyway so that was a logical place to start. Hopefully this story helps someone in the future. Regretfully I didn’t scan for codes before I did everything.
    • 2022LtTbZ71
      Service 4wd, ESC light, traction control light on, Service charging system (vehicle may stall)

      By 2022LtTbZ71 · Posted

      That stinks. I’m sitting on the side of the road right now with the same issue. Never had an issue before taking it in for the ground strap recall. Now I’m outside of warranty and they’ll probably want $200 just to diagnose what they already “fixed”. 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...