I was having intermittent cooling. Cooling on startup then shutoff and warm, but not hot air, on highway. Really HOT air is probably a monovalve leak and can be fixed according to previous posts. I went through the monovalve issue and finally fixed that, then "topped off" the 134a this spring, during relative cool ambient temps. When it got really hot here and I was still having problems, and I also was thinking of buying a complete monovalve. Instead, I just took it to the local Indy and told him the history and "fix it" then held my breath.

He called and said it was fixed, that I had overcharged it and the compressor was shutting off after working for a bit due to too much pressure. He charged me $65 to test the system and bleed off the excess freon, but he also gave the car a good going over and had some useful observations and suggestions, and I believe it was well worth it. He also found a slow leak in the condensor, so I can plan for that in a couple months. The AC system is not really suited for south Louisiana summers (or Houston) even when it is optimal, but it can be made to work. And sometimes going to your local Indy can be a wise decision, though I fought it for a long while.

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1983 CD
1958 Studebaker Packard (being resuscitated)