134A swap
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Logistics Pro
Joined: Feb 2000
Posts: 3,955
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From: Mesa
134A swap
Been trying to get my ac up and running. I had planed on using R12 but I am not finding any deals at all on it. It's running $30-$40 a 12oz can. My question is, those folk who have opted for 134A hows it cool? Does it work OK?
Cargo Master
Joined: Nov 2009
Posts: 2,364
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From: starship enterprise
YOUR 134 should work ok. You need to get all the old oil out of the system, and replace the dryer, expansion valve, and the oil. Leak test before opening it up and look for anywhere to fix a leak before opening it up and fix them all at the same time and open it once.
Your problem isn't going to be cooling, though. Usually in these systems that were older and for r12, they have more rubber lines, and this will leak slowly the r134, because the 12 is a larger molecule than the 134, so the 134 uses more metal lines, and the rubber lines won't hold the freon as well. It might need charged every year or so.
Your problem isn't going to be cooling, though. Usually in these systems that were older and for r12, they have more rubber lines, and this will leak slowly the r134, because the 12 is a larger molecule than the 134, so the 134 uses more metal lines, and the rubber lines won't hold the freon as well. It might need charged every year or so.
Posting Guru
Joined: Sep 2009
Posts: 1,159
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From: Suburbs of Chicago
In the industry we've been finding that the r12 penetrates the walls of its hoses just slightly, enough to make a protective film so that 134a does not have anywhere to seep through the hoses. You will have to change to the correct o-rings though if you ever open up the system.
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