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    Rear a/c changes temp without command

    Yes, I have a tech 2. I'll check for codes for that. I forgot this can have codes for stuff like that. Oops. It does have the 'auto' function on the control in the front climate control. I disconnected the wire to the blend door actuator (middle of the rear hvac assembly blend door actuator...
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    Rear a/c changes temp without command

    Hey all, truck has done this a few times. Never stuck around though for me to troubleshoot. The rear ac usually blows nice and cold... well suddenly today it started blowing hot(heated) air. Turned off rear ac, front blows cold the whole time. I checked the controls front/rear and they were set...
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    07 XL Denali

    Figured it out and got it fixed on my own thanks. This video helped.
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    07 XL Denali

    Anybody??
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    07 XL Denali

    I plugged the level control module in. compressor turns on and stays on now (until it shuts off I'm assuming for heat reasons), then turns back on after a wait time. Both new pumps do this. Does a level control module that was a used part(got it from ebay, same part#) NEED to be programmed? or...
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    07 XL Denali

    just got my used level control module in the mail. I thought I could use the tech 2 to reprogram it but it seems I need something else to do so? Help?! lol
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    07 XL Denali

    nah, it seems to be sealed. just the mount was broken off. so it was just the silver part and the connector.
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    07 XL Denali

    I pulled it down, cleaned connections etc. No change after that. The module is supposed to be riveted to to a mount, the rivets failed and I was able to remove it as soon as I touched it. I'm guessing that much vibration etc could damage it? Weather has been crappy when I've had free time its...
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    07 XL Denali

    So the rear shocks should show 0% when I'm not driving essentially? I'm suspecting the level control module as well now. This is what i was worried would happen trying to stick with the factory air ride lol. Any idea where i could get a level control module besides dealer (I'm on a...
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    07 XL Denali

    I will check that when I get a chance to lift it up and get underneath lol. I did mess it with it some more today. I jumped the relay connection (battery to the blue wire). both compressors worked in that configuration lol (ran for 30-40 seconds no problem). only 1 turns on for self test with...
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    07 XL Denali

    No idea on the current. Thank you, I will try and give that a shot
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    07 XL Denali

    connection at the pump looks close to perfect considering 168k miles. I'm going to try and jump the relay in the next day or two, see if it will stay running while its jumpered so I know its at least not the power wires. Also going to check the chassis module/computer (whatever that is called)...
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    07 XL Denali

    They both work with 12v applied directly The original does not
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    07 XL Denali

    Well, picked up a new unit (dorman). Doesn't work at all. No self test, exh valve and compressor don't do anything via tech 2.
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    07 XL Denali

    oh ok gotcha. did all of the above. still can control exh valve, no compressor does not turn on other than for self test. I also tried raising/lowering the front and rear to see if it would trigger a adjustment (it didn't). I did see a code for C0660 'level control exhaust valve circuit short...
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    07 XL Denali

    yea I understood. They were the first thing I checked, I'll check again though as I did not know about #2. I was referring to the fact that before nothing happened, now the self test at least was happening so I thought I was making progress lol. There is no fuse 58. I'm looking for other...
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    07 XL Denali

    I believe that is the self test function(powering on for a few seconds) . It wouldn't turn on at all before(relay replacement fixed it) . Figured I was making progress.
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    07 XL Denali

    Yea, I'm pretty confused by that considering it turns on when a few seconds after I put the key in the ON position or start it. Thank you for the response. I'll check to see if there's another fuse I'm missing. Or relay?
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    07 XL Denali

    ok. can someone at least point me in the direction to find more info on this? Googling has found me little more than what I've done, and the forum hasn't brought up much either. recap: my compressor is just connected to the harness NOT the air lines. it turns on with key on/start for about...
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    07 XL Denali

    took a shot and changed out the relay with the one from autozone. compressor is still just temp connected at the harness, not fully installed. no air lines connected. it now powers on with the key for about 3-5 seconds, but does not turn on via the tech 2 scanner(exh valve responds, but nothing...
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    07 XL Denali

    Is it this one? Seems like it. Also see a completed unconnected wire by the same harness. Pics attached. If thats the correct relay autozone has it for $20. Part # 19265 .
  22. C

    07 XL Denali

    new compressor didn't come with a relay I don't believe. I will double check when I get a chance (its pouring right now and I'm on my phone at work) I bench tested both the old and new one. new one comes on with 12v power, old one does not
  23. C

    07 XL Denali

    Anybody?
  24. C

    07 XL Denali

    I temporarily connected a brand new compressor to the yukon. the exhaust valve opens/shuts when commanded. the compressor does not do anything. i have 4 suspension faults, all are faults with the front suspension (short to battery(says passed on both) and circuit open (says failed)for both front...
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    07 XL Denali

    removed compressor. its either original or an old OEM. it did not fire up with direct power. I'm looking to buy a compressor from a local store. I've got Dorman (which I've heard is not good), or Arnott. I have 2 Arnott options P3242 and P2793. Any idea which would be better or if theres a...

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