Usually u can use the same amout of R-134a as R-12. Personally i prefer R-12 because it'll cool faster and colder that the R-134a MOST of the time. That doesn't mean i havn't felt some COOOOLD R-134a systems. We stopped refilling R-12 systems last spring at my shop though, one because R-12 is, well, illegal. And 2, we could get a 50 lb. can of it but do u have any idea the cost to grab some of that stuff? 1200 dollars! A 50 lb. can of R-134a costs about 60 bucks. As far as the A/C running, i agree with the statement that it will only run at a certian ambient temperature. Below that you're running the risk of blowing seals because of it being so cold. We all know what kind of cool our systems can pump. My car'* A/C bit the dust long ago so i don't have to worry about it.
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