Car Information:
Chevy G10
Year: 1985
Engine Size: 305
Trans: Automatic

Issue / Question:
Greetings,
I need to convert this van to 134a and replace the compressor, drier and exp. valve. My question is this. There are two models of compressors listed. One has a coil connector at 12 o’clock and the other at 9. When I look at my compressor from the opened hood the connector is at 10:30. I have asked at a couple of supply houses and no one seems to know which is which and the big question is, why is the 12 o’clock $100 more? If that is the only difference I can stretch the wires to fit for $100.
The second part of my question is, I understand there is some kind of orifice on the back of this compressor that if not specifically set for 134a will not operate correctly. So If I am buying a compressor for a 1985 vehicle will it come with an R12 orifice or do all compressors sold today have to have an orifice for 134a? I have good experience replacing all parts of AC systems before but not performed a conversion before. Any other hints or suggestions? Thanks again for the show and your invaluable help.

Answer:

The CCOT tube is located in the high pressure hose not the compressor. If the compressor bolts up and the wire reaches the coil I don’t see a problem.

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