| Re: [GMCnet] air conditioning questions [message #134550] |
Thu, 14 July 2011 02:38 |
Richard Brown
Messages: 281
Registered: May 2009
Karma: 1
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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.
Richard & Carol Brown
1974 Eleganza SE
"DILLIGAF"
Lindale, Tx. 75771
903-881-0192
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Richard & Carol Brown
1974 Eleganza SE
1174 Hickory Hills Dr.
Murchison, TX. 75778
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