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Thanks. I did a similar r134 conversion on an 80 mercedes 450 with no issues but I have read that the gm compressor and dryer are not compatible with 134. I don’t see how that could be correct. Any thoughts?
Thanks Melsg5 for the link. Very helpful. So here it is from Original Air Group/Classic Auto Air should anyone else choose to attempt this: my 79 has an orifice tube that needs replacing. I am looking into a bypass that allows the compressor clutch to engage the compressor as needed, rather than to run constantly when the ac is on.
The one issue I am having is finding a 3/8 x 24 high side R134a adaptor with a schrader valve installed. The low side (blue cap, large hose) is 7/16 x 20 and I have it, but not the high side. Advance Auto Parts has an Autocraft kit with a 3/8 high side fitting as does Auto Zone. I will check them out. Some of these kits do not have the valves. We shall see.