A/C recharge

chrslws · Posted: Thu Jan 17, 2019 4:08 pm Post subject: A/C recharge

Any reason not to recharge my A/C system myself? Local shop wants $190 to do it. I can 'borrow' a vacuum from the local auto parts store, and then it's just a matter of some manifold gauges and putting in the correct amount of refrigerant, right? The R134 I can buy is just as good as theirs, yeah? I had to replace some o-rings on the compressor, so i replaced the dryer as well. Thanks in advance! I have a '93 with front and rear air, FYI. Sticker under the hood says 1350g. I'll need to add oil as well since I think most leaked out around that bad oring.

Zeitgeist 13 · Posted: Fri Jan 18, 2019 5:57 pm Post subject: Re: A/C recharge

If you opened it up and don't know the exact amount of oil in the system, then you should probably pull the dryer back out and flush everything to start fresh. Then you can add oil to the dryer and pump in the amounts spec'd. Is the vacuum pump offered by the local parts store a legitimate unit with at least 4CFM? If it's just one of those air compressor types sold by HF, then don't even bother.
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Abscate · Posted: Fri Jan 18, 2019 8:15 pm Post subject: Re: A/C recharge

If it leaked from an oring seepage you won't have lost any oil. Just add oil to the new dryer, you can get the charge by weight, then evaluate the low to high side ratio to get the charge right
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chrslws · Posted: Sat Jan 19, 2019 5:06 am Post subject: Re: A/C recharge

Thanks all. I think the advice to flush is my best bet. I definitely lost some oil; that was my first clue the seal was bad actually. It was the lower seal on the compressor so I guess some oil accumulated there. I'll have to check to see what type of vacuum pump they offer.

Abscate · Posted: Sat Jan 19, 2019 7:04 am Post subject: Re: A/C recharge

If it held pressure , skip the flush. Most of the oil ends up in reserve in the accumulator so you can Replace it there. As long as you keep the excess oil out of the compressor, you can overcharge the PAG 2-3x without problems. It's not that critical.
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chrslws · Posted: Sun Jan 20, 2019 5:39 am Post subject: Re: A/C recharge

Thanks! For future reference, is there a book or good website to read about servicing A/C system so I have more than a basic working knowledge?


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