2003 Yukon AC not blowing cold

Discussion in 'Engine & Drivetrain' started by Wahoo2, May 12, 2018.

  1. Wahoo2

    Wahoo2 TYF Newbie

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    Our 2003 Yukon with rear air isn't blowing cold air. I wouldn't say it's warm, just not cold. I set the AC on 6o degrees and put the blowers on high. I connected a gauge set. Can someone help interpret the readings?
    72F degree Day
    Low gauge cycled from 25-55
    High gauge cycled from 78-125
     
  2. Randy Whistler

    Randy Whistler Only visiting this planet Supporting Member

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    Does your compressor cycle on/off frequently when trying to cool? Generally speaking, if the compressor cycles on/off frequently during cooling, you're low on refrigerant in the system, which implies a leak somewhere.

    Does the compressor run normally when cooling but does not cool properly(as reported)? Still could be low on refrigerant . .

    I can't help with the PSI readings but am sure someone can. I would suspect you're low on refrigerant but without actually putting eyes on it, it's just a Scientific Wild-Ass Guess(SWAG) on my part!
     
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  3. Wahoo2

    Wahoo2 TYF Newbie

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    Thanks for the response. The compressor does cycle on/off, but I wouldn't say it's excessive. I think I am going to try and add a little refrigerant and see if anything changes. We have had the vehicle 2 years so it's hard to say what maintenance has been done to it. It's just stopped blowing cold, no noises or anything.
     
  4. Randy Whistler

    Randy Whistler Only visiting this planet Supporting Member

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    Well, I think that if you invest in a charging gauge set at WallyWorld or wherever, it'll be money well spent, if for only the ability to see what your pressures are in your system. Be careful not to overcharge, though!
     
  5. Wahoo2

    Wahoo2 TYF Newbie

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    Thanks for your response. I actually got a set of gauges, that's how I posted the pressures in the original post. I m just going to add little refrigerant.
     
  6. Danny3737

    Danny3737 Full Access Member

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    Check your fan clutch
     
  7. Scottydoggs

    Scottydoggs Full Access Member

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    give this a shot, good old actuator reset.

     
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  8. Wahoo2

    Wahoo2 TYF Newbie

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    Didn't think about that, Thanks
     
  9. Wahoo2

    Wahoo2 TYF Newbie

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    Thanks for posting the Video!
     
  10. Justinj360

    Justinj360 Senior Member Supporting Member

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    Can the rear HVAC be reset like in the video or does it reset the whole system when you use that method?
     

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