I recently replaced just about my entire A/C system. I'm still using the old style long compressor, which I believe is the A6. The radial is called A4. I may have them backwards, but I think that is right. I asked around alot before doing the job and the one piece of advice I got over and over again was to buy a new compressor rather than a rebuild. The rebuilds can be found for less than $100 and a new one is about $400. I bought a new compressor and it is making noise anyway, so I am a little pissed. I was also told to buy A/C Delco, but I got conflicting reports regarding whether or not A/C Delco still makes the A6. I don't think mine is made by A/C Delco although it was represented as A/C Delco when I ordered it.
With respect to freon, I used something called "Freeze 12" which is supposed to be sort of a blend between 12 and 134a. At least that is how it was explained to me. I was told that it is colder than 134a. It seems to blow pretty cold to me, but I haven't had a truck with 134a to compare it with.
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