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Just a thought
I fought this A/C nightmare (diagnosis) earlier this year - and my problem was exactly as you described. Check this first before you turn into a "jello head" like I did. There is a sensor on top/near the upper radiator hose - a dual pole and a single pole. Disconnect the single pole and see if this allows consistent cooling. My compressor side evidentaly was going bad (sometimes worked sometimes didn't) but the guage/light terminals worked fine. (Cheap part easy fix)
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