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Thread: Rear HVAC

  1. #1

    Default Rear HVAC

    Ok. So I bought this 2005 Tahoe & the rear HVAC only blew cold. The dealer gave me a service contract to fix it (which is the only reason I went ahead & bought it). So, they replaced both the mode door & blend door actuators & it worked for about a week. We leave it on heat for the kids, so we never even messed with the thermostat. Yesterday, it went full cold again & WILL NOT move. I also noticed the lights inside the overhead controls for the rear hvac are out. Any thoughts? The dealer says they don't know what it could be & I don't want to spend the couple hundred $ to replace the overhead controls & the control module. Could those be it? Anyone else solve this issue?

    Thanks & sorry for the long post,
    Greg.

  2. #2
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    Isnt there a fuse for the rear heat module?? im not to up todate with the newer OHC rear HVAC...
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  3. #3

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    I don't remember if there is or not, but all the fuses have been checked anyways. The fan control & mode control both work, just not the temp control. Even the digital dsplay on the backside of the center consol works fine, just that the blend door will not budge.

  4. #4
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    Hmm wonder if the blend door motor went out again...
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  5. #5

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    That's always possible, but then the question is what's killing that so fast? I guess i'll let the dealer replace parts, it's not my money they're wasting!!

  6. #6
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    exactly... and its not always what is killing it, it is more related to the quality of parts they are installing. Since alot of parts suppliers meet OEM requirements but when things are mass produced there is an "acceptable" failure rate.
    Mike

    Currently

    1997 Chevy S-10 Blazer 4X4 with 330K miles and counting (Hunting rig).

    2009 Saturn Aura XE (wifes car)

    2011 F-150 Crew 4X4

    "Hold it to the floor till you see God.... Then Brake!!!!"

  7. #7

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    Very true. The parts were from their GMC dealer & are 'factory parts' supposedly. But i'm going to try to get them to rplace both the overhead control (since the bulbs are all dead, hehe) & the control module.

    Thanks, Mike, for your thoughts.

    Greg.

  8. #8

    Default

    So here's a little update.

    The dealer (on their own dime) replaced the overhead control unit. And guess what, it STILL DOES NOT WORK! Really what else is left besides the control module & the temp sensors? Anyone ever hear of the temp sensors going out? If they can't fix it, they WILL be buying it back (as per the sales contract), which I would rather not do but if that's what it comes down to, then it is what it is.

    Any thoughts anyone? Replaced: both actuators (blend & mode doors) & the front overhead control unit. The mode selection works fine, as does the fan speed. Just the temp control does not work, just automatically sets itself to cold.

    Greg.

  9. #9

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    So I got it fixed MYSELF after the idiot dealer spent the $ to replace the parts. I did a google searched & found a thread on fullsizechevy.com. Here's a pic of what I did (pic is from the site, I just copied the idea).Click image for larger version. 

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    Basically I opened the case carefully, added the small nut & bolt as an extra stopper (because the basic problem is it over turns itself) & re-installed. It works PERFECT!!!! On heat or A/C it works GREAT!

    Greg.

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