2004 Suburban AC starts Blowing hot air out driver vents

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by jes1766, Jun 10, 2011.

  1. jes1766

    jes1766 New Member

    I got a 2004 Suburban that sometimes blows hot air out of the driver vents, while the rest of the vents blows cold air. If I turn the Suburban off for a couple of minutes then turn it back on, all the vents blow cold air. It was happening once in awhile, but lately it is happening almost daily. Does anyone know what is wrong and how to fix it.
  2. Crispyt

    Crispyt Rockstar 100 Posts

    I dont really know for sure, but im assuming your vents are turned on and off eletronicaly and there could be a problem in the control unit where you change the direction of air. If you cycle through the different vents does it change or make a difference?
  3. Bigg Ron

    Bigg Ron Rockstar 100 Posts

    Does your truck have driver passenger seperate vent controls?
  4. jes1766

    jes1766 New Member

    It only does it on the driver one by the window and the one above the radio, the two on the passenger side and the back ones still blow cold air. My brother said there is a relay in the dash that is going bad.
  5. bucd

    bucd New Member

    Sounds like left temp actuator. Mine is doing same thing (04 silverado).

    I found a post here while searching about resetting the actuator. Give this a go:

    - With car off, pull the 10A HVAC fuse (located in fuse box on driver side panel with door opened)
    Check fuse just because you have it out already, but should be ok.
    - Turn key to accessory
    - Let it sit there for a min or two.
    - Turn key off
    - Plug 10A fuse back in.

    Another one I found was about cleaning the actuator. Located under driver dash about the gas pedal.
    Just note how the part/pieces go together when taking it apart to clean.

    I just posted up to ask if there's a way to rewire the right to the left side, so it can bypass the "bad" right temp actuator. Controls would be used only on the left of course. I would think this is doable but not sure.

    Bighornkid likes this.
  6. wbmartin3

    wbmartin3 New Member

    I've had the same problem for years - turn the key off and it resets

    Heck, I've learned how to reset it doing 65 on the freeway (a necessity in the South), but I'm hopeful this fix will work. Can't wait - I've searched this forum since the issue first appeared - my wife has the car right now, but should be home in a few minutes!


    (next day)

    I tried the reset suggested and then took the subn to a local store. While idling there, the driver-side a/c switched to heat while the passenger side stayed comfortably cold. Consequently, I reset the system AGAIN when I returned home and - so far today - the a/c hasn't switched to heat. I did allow for a little more time (around 4 minutes vs. about 2-1/2 the first time). I'll report in a few days whether this has appeared to taken care of the problem.
    Last edited: Jun 30, 2011
  7. Sandhopper

    Sandhopper Rockstar 100 Posts

    X2 sounds like the temp actuator... My 04 Silverado used to do the same thing... Would drop it in "N" turn off the ignition and then restart... Worked almost every time. I do not suggest you try this in traffic... Ya might want to pull over first.
  8. johnnybburn

    johnnybburn New Member

    I had this same problem. It's the blending/actuator unit. The driver's vent actuator is on the passenger side and the easier of the two to get to. It's not hard to replace on your own. Some of the bolts are a bit of a pain, but it's doable even for the novice.
  9. kspeng

    kspeng New Member

    lmc now sells the actuator
  10. Dave P

    Dave P New Member

    Thank's guys for the info! I pulled the fuse and reset the unit and it worked. I appreciate the help!

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