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Re: R-134a substitutes (automotive AC)
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Posted by jdemaris on March 10, 2004 at 19:02:10 from (209.23.31.57):
In Reply to: R-134a substitutes (automotive AC) posted by Mike (WA) on March 10, 2004 at 08:13:13:
What is your problem with 134A? It's easy to buy (no license needed), and seems to work fine. I've done over a dozen of my own vehicles with it with no problems that relate to the the refrigerant itself. I had a few friends that complained it was "no good", but after looking in to it a bit, the problem was their installation. One guy simply installed the gas without pulling a vacuum on the system first. That won't work well with any refrigerant. Another guy complained that it leaked out faster than the R12 did, and that's true. He should of fixed the hoses. 134A and a few other commercial refrigerants have a smaller molecular structure than R12, and as a result, can escape from many types of rubber hose. Commercial stuff usually has no rubber, so it's not problem. Cars and trucks, however, have to use rubber lines since they hook to an engine that jumps around on rubber motor-mounts. Most cars built for use with R12 used rubber hoses that are more porous than the new ones. When 134A came out, AC hoses for cars were changed to "barrier hoses", which means they have a special liner inside to better hold gasses like 134A.
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