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joe0508's avatar
joe0508
Explorer
May 04, 2014

ac recharge

I have a 93 chevy p30 454 bb with tbi.I would like to try and recharge the ac.Can someone tell me where the low side valve is located.I know i have one valve under the hood and one on the backside of the compressor.Which one of these would be the low side?

14 Replies

  • joe0508 wrote:
    donn0128 wrote:
    You likely will not be able to buy the freon, so just take it to a qualified service station and have them perform a leak test and then recharge the system. This is really not a DIY job, and needs to be done using the proper equipment by a trained and qualified service person.
    Can you tell me why you dont think i will be able to buy the fron?


    1993 was the magic year that everyone stopped producing R-12 equipment. With yours being a '93, it could be either R12 or R-134a. If it's R-12, it has been illegal to buy or sell R12 since 2000, so no one is going to have it. If it's R-134a, the auto parts stores are going to have it, but I'm not sure if they will sell it to you unless you have an EPA card. Also, the leak would have to be found and repaired or you will be back to recharging, and since you don't know how long it actually took it to leak down, you don't know how large the leak is or if it's repairable.
  • donn0128 wrote:
    You likely will not be able to buy the freon, so just take it to a qualified service station and have them perform a leak test and then recharge the system. This is really not a DIY job, and needs to be done using the proper equipment by a trained and qualified service person.
    Can you tell me why you dont think i will be able to buy the fron?
  • The low side has a bigger hose than the high side...The charging hose on a can of refrigerant will only fit on the low side...if you have a manifold gauge set, the low and high sides are different sizes so they can't be hooked up wrong...I'd recommend you find a qualified shop to do the work (find the leak, fix it, and recharge)
  • You likely will not be able to buy the freon, so just take it to a qualified service station and have them perform a leak test and then recharge the system. This is really not a DIY job, and needs to be done using the proper equipment by a trained and qualified service person.