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another successful DIY - AC pressure guage
Posted by MS (more from MS) on Sun, 4 Jun 2006 09:47:59
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When I overhauled and reverted my AC system to R134a a few years ago, I didn't have a pressure guage set-up to monitor the correct amount of refrigerant. I just went by the advise of others regarding how much to safely "SUC" into the compressor - which was less than 24oz. And I'd top it off once a year with an 8oz can when the vent temps are noticably less cool than normal. So long as it blows cold-ish air on the hottest days, I know it's within the limit. That's hardly precise, but it has worked so far.
So yesterday I was shopping in the local Pep Boys and noticed a new (to me) product - an AC service hose which included a guage for R134a. The hose was the same as the supply hose I use with the refrigerant can valve threading on one end, the compressor fitting lock sleeve at the other end, and a 3" guage in the middle using a T and crimp fittings. I looked at it and realized I could make one of my own using a 3" cylinder compression guage I already owned, plus a few fittings and a pair of small hose clamps. I used a brass 1/4 pipe T fitting, two 1/8 i.d. hose barbs to 1/4 pipe adaptors, cut the hose, inserted the barbs, threaded together with the T and voila, homemade AC pressure guage. The connection on the guage was also 1/4, sit couldn't have been easier. With the guage, I'll be able to monitor the precise amount of refrigerant, which, according to the Pep Boys guage instructions should be no more than 45psi. Total cost - $8. The Pep Boys version was $19.95
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