| Re: [GMCnet] air conditioning questions [message #134577] |
Thu, 14 July 2011 11:48 |
KB
Messages: 1262
Registered: September 2009
Karma:
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Senior Member |
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> If you're looking for a quick & cheap vacuum pump, find a refrigerator or deep freeze with a leak & a working compressor. The compressor is slow, but it pumps a decent amount of vacuum. Solder a Low-pressure service tap in the suction side of the compressor. Remove the center valve from it. You'll need to buy a small bottle of refrigerant oil & squirt some into the suction side. It won't hurt it because the suction pipe opens into the sealed case. You want to do this because the compressor will spit a tiny amount of oil out when running. You could put a trap on the discharge side to catch it. I put a fitting on both the suction & discharge lines so that I could cap them. It quit long ago, but it had worked 15 years in the refrigerator & 10 as a vacuum pump and since it was a freebie I can't complain (the fittings cost, but not much). If I ever have need of a vacuum pump, I'll likely do it that way again.
> ?? Some repair shops may have an old compressor lying around their shop that you can get cheap, if not free. Just tell them you want it to use as a vacuum pump or they may try to sell you a new one if they think you might use it to replace a refrigerator compressor.
Would this work with an old RV roof a/c? If so, I have one
free for the taking if anybody wants to try it. It's still in the a/c.
I was planning to scrap it. I believe the compressor works, but is
low on refrigerant. I'm in San Jose, CA.
Karen
1973 23'
1975 26'
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Karen
1975 26'
San Jose, CA
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