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  1. #1

    Default Im recharging A/C, bypass pressure switch?

    Hi. I have a 93 sierra. I need to add r-12, i am vacuuming it down now. Is there a low pressure sensor I need to bypass. Or will the clutch kick in as I add Refrigerant?

  2. #2


    You sure it's R-12? If so, perhaps you should consider upgrading to R-134a. It's alot cheaper and easier to get. That being said, you should be able to just dump it in on the low side and the compressor should kick in and pull it through. Good luck!

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

    There are 10 kinds of people, those who understand binary, and those who dont...

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  3. #3


    Never mind. It was the switch on the accumulator. Shorted it. Thanks anyway.

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