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Registered
Join Date: Jun 2009
Posts: 745
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Shopping for a/c gauges have questions....
Hi guys I am shopping for a/c gauges and have a few questions.
Is it possible to find gauges that I can use with r12 and r134? Do I need the gauge scale to show r12 and r134? Thanks |
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09-04-2011, 05:54 PM
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Fleabit peanut monkey
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Gauge sets will have adapters for R134. At least the Robinaire I am familiar with. Pressure is pressure. The gauges will tell you the pressure. You need a graph that shows pressures where R12 and R134 liquify (from being pressurized) at a given condenser pressure. Then from this table/graph you can determine if your system is working ok.
The two refrigerants have different properties. R12 evaporates at a lower temp than R134 and is much more efficient. This guy is a hoot: http://www.youtube.com/watch?v=80jSH8VQZms Edit - If you want to get down with your bad self, go to the MACS web site and sign up, study and take (and pass - open book) their EPA 609 test and you can buy R12 legally. I just bought a sealed 30 pound tank of Dupont Igloo R12 for $325 on EBAY. I had to drive to the guys house as he would not ship but I got ten years of R12 in my hip pocket at a cost of eight dollars a can. All this talk about Freeze 12 blah blah. Take the test and you can buy R12 cheaper than R134, which is NOW 14 bucks a can. http://www.macsw.org//AM/Template.cfm?Section=Home Call them and be free. Last edited by Bob Kontak; 09-04-2011 at 06:25 PM.. |
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09-04-2011, 06:11 PM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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i had a hard time finding an adapter to convert r12 to 134 threads. my vacuum pump has the older r12 type threads and when i bought a set of gauges for 134, i had to get an adapter to convet the "squared" off 134 threads to the old stuff.
i found a set of gauges at advance that did both r12 and 134. the hoses where the r12 type but screwed onto fittings for 134. i stopped using the gauges for both r12 and 134. i did not think it was a good idea to use them for both. i saw the ones in advance te other day for around $80-90.
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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09-06-2011, 05:20 AM
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Registered
Join Date: May 2002
Location: St Louis
Posts: 4,211
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You are really supposed to change the hoses also to keep the oil isolated but I'm not sure that s really necessary.
https://www.ackits.com/pc/98661-PRO/RefrigerantGaugeSets/Mastercool+98661-PRO+-+R134a+%26+R12+Dual+Manifold+Set
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Rick 88 Cab |
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09-06-2011, 05:52 AM
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1981 Porsche 911 SC Targa
