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  1. #1
    Jr. Apprentice
    Join Date
    Feb 2011
    San Diego CA

    Question AC not getting cold

    I just bought a 99 Suburban with 104,000 miles. The rear AC gets a little cool but the front does not get cold at all, the compressor kicks on and stays on, the gauge on the bottle of R-134A I bought reads just above 45psi and just into the alert range. I did not put any freon into the system since it read over full. Any ideas.

  2. #2
    stephan's Avatar
    Join Date
    Sep 2010
    Far West, Oregon USA,
    Blog Entries


    The guage is reading the low pressure side of the system, or you hooked it to the high side by accident & it is undercharged.. I don't know how much experience you have so please read cautions below.
    Do the following with out the freon can hooked to your system!!
    Start it up, turn on the AC & look at the sight window on the reciever drier. If you see bubbles, it needs a charge. You may need a mirror & flashlight to see the window.
    Always wear safety goggles when working on AC because liquid freon will blind you if you get it in your eyes, & MAKE SURE you know the difference between the high side & the low side of the system, because accidently charging through the high side of the system will blow up the can!! If you have no AC experience, I would recommend that you take it to a shop to be charged if it needs it!!
    Last edited by stephan; 02-13-2011 at 07:46 PM.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

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