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Thread: A/C Issue

  1. #1
    Join Date
    Sep 2008
    Location
    Florida
    Posts
    77

    Default A/C Issue

    2003 Chevy Tahoe 5.3L. My wife started the Tahoe and she heard a pop and white smoke (R134a) come out from under the hood on the passenger side. When I checked under the hood I saw oily residue on the bottom side of the hood right above the high pressure schrader valve for the A/C unit. I run the engine for a few min then turned it off and could hear hissing from the same fitting. My question is it possible this valve "popped" off loud enough to hear from inside the vehicle with the engine running or should I look for another leak? Has anyone had the same problem? I looked in the fitting and saw a black rubber cap/diaphragm shape, I assume the schrader valve is under it?
    2007 GMC SIERRA CLASSIC
    6.6L LBZ 136,000 miles
    Diablo Sport Predator Tuner (MPG Tune)
    LT245/75R16E

    "Just because you are unique, does not mean you are useful."

  2. #2
    Join Date
    Apr 2001
    Location
    CA
    Posts
    13,573

    Arrow

    That's a pressure switch, and it sounds like it blew apart. Not common, but it happens. Identify if it's high or low (is the switch actually ON the high pressure line, or above it on the accumulator or low pressure line?). Under it is the schrader valve. The switch threads on/off. Replace the switch, recharge and you should be back in business. Don't let is set overnight with the blown switch, or the temp changes will cause it to draw moisture/air in. Remove the switch and the valve will seal, until you replace it. Because the system was never "open", you don't need a complete evac/service, just a recharge.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com

  3. #3
    Join Date
    Sep 2008
    Location
    Florida
    Posts
    77

    Default

    Done. Replaced switch/valve, vacuumed and refilled. 42 Deg again. Thanks.
    2007 GMC SIERRA CLASSIC
    6.6L LBZ 136,000 miles
    Diablo Sport Predator Tuner (MPG Tune)
    LT245/75R16E

    "Just because you are unique, does not mean you are useful."

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