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Old September 20th, 2018, 05:35 PM
jrmunn jrmunn is offline
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Join Date: Feb 2013
Location: Davis, California
Truck: 1964 1500
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Default Re: Mark IV dealer installed A/C


I have a Mark IV AC set-up on a 1964 GMC 3/4 ton with a 305E engine. The in-cab unit has a rectangular set of air deflectors, which is different than some of the round units I have seen, but my compressor looks the same. Mine is a York brand that is still available for purchase. The one on the truck still turns, and the belt is on it, but the refrigerant seems to be gone and I have been told that the compressor leaks. Of course it uses Freon based R-12 that is expensive. My thought is to replace the compressor and look into converting to the newer refrigerant (R-34?), but I have not gone far enough with this to talk about details.

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