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Thread: A/C Recharge for R12

  1. #21
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

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    Fittings for R12 and R22 are the same for high and low sides. It was the R134 that made different fittings. The reason was to reduce the amount of gas vented when the hoses were disconnected and attached. They also made them different sizes so as not to attach the wrong charge hose.
    Dave M vin 03572
    http://dm-eng.weebly.com/

  2. #22
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    I understand. So now I am sure. I attach the R12 fitting to the cap on the left side of the system.

  3. #23
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    Ok, so I didnt end up recharging the system. When I attached the r12 adapter and hooked up the regulator with the can. I gotba regulator reading of 58PSI. Just at the blue meets yellow. I take that as it doesnt need a recharge. I dont understand why my ac is not blowing very cold. The ac belt is turning when the car is on. Any ideas?

  4. #24
    Senior Member
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    Location:  Austin MN

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    To show true pressure the compressor has to be running. And that is how you ad refrigerant it sucks it in. When running if my memory serves me it should be 30 to 35 psi.
    Last edited by WHO1DMC; Yesterday at 09:05 PM.

  5. #25
    Not really banned Michael's Avatar
    Join Date:  May 2011

    Posts:    3,277

    Quote Originally Posted by Felix_29 View Post
    Ok, so I didnt end up recharging the system. When I attached the r12 adapter and hooked up the regulator with the can. I gotba regulator reading of 58PSI. Just at the blue meets yellow. I take that as it doesnt need a recharge. I dont understand why my ac is not blowing very cold. The ac belt is turning when the car is on. Any ideas?
    Was the engine or AC system off when you connected your hose? I really think you need to heed my original advice, this is not a job for someone with limited knowledge on AC systems.

  6. #26
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    The car was off when I hooked up the regulator.

  7. #27
    Not really banned Michael's Avatar
    Join Date:  May 2011

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    Quote Originally Posted by Felix_29 View Post
    The car was off when I hooked up the regulator.
    Then you have no clue what the actual low pressure was.

  8. #28
    Not a DeLorean Guru
    Join Date:  May 2011

    Location:  Rochester, NY

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    Take the car to an A/C shop. Seriously.
    -Mike
    1981 DeLorean, Carb LS4 swap completed
    1999 Corvette, cam/headers/intake manifold, 400 rwhp
    2005 Elise, stock
    2016 Chevy Cruze

  9. #29
    Member
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    Well it is obvious you guys do know more than I do about this. You guys obviously learned this a/c stuff somehow yourselves. How would you feel if someone said to you "Don't do this job yourself" or "take it an a/c shop. seriously". I'm not sure why you feel i'm not capable of learning what you know... I won't learn anything if I keep taking the car into a shop every time it needs something. I'm trying to be learn more about my car and be cautious at the same time. I think i'm doing the right thing by taking it slow and asking questions. I'm not totally green to this. I only lack experience. I thought that was the point of this forum. For owners to help owners. I do appreciate the help I have received on this thread.

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