A couple of thoughts come to mind: The problem could be as simple as a low refrigerant charge. Has the A/C ever been serviced--that is, recovered, evacuated, and recharged according to the exact weight-of-charge? It could also be the control valve that's acting up. If so, and with that kind of milea...

I am surprised that you mentioned the 3.3lbs could possibly be a bit low for the charge. While doing research, I found the GM retrofit guide with that formula: R12 charge x 0.9 - 0.25lbs = R134a charge. In my case, that would be 2.9lbs. I trusted my mechanic who said that from his experience, these...

Thanks, Tim. Duly noted.

Well, it took a while, but very glad you found the problem. Appreciate your following up and letting us know.

My name is Felix from Frankfurt/Germany, new to this forum. Hope you are all doing well. I registered to get some help with the AC system in my car. The car is a 1989 Chevrolet Caprice Classic LS Brougham, 45k miles, stock 305 TBI. Welcome from the USA. Background info: -preowner converted the AC i...

IIRC (it has been a while), the answer is yes, as long as the threads are the same. The superheat switch is part of a fail-safe circuit for the A6 in your application. If the back of the compressor gets too hot, the SH switch senses that, closes, and grounds the hot wire to the clutch, causing the (...

So far no luck in getting any replacement for that line, so I am wondering about repair. I found a short piece of hardline with a female o-ring fitting like this: (photo removed) I would think that cutting off the old end and replacing with the above should be easy, but how best to splice this? Cou...

I purchased a couple of new caps at NAPA today. I'm guessing they should be installed until they are snug, and then tighten just a bit more. But maybe someone can let me know how much force is needed when installing the caps in order to avoid refrigerant escaping. The caps are usually plastic, so d...

Thanks, Tim. I thought that might be the reason.

And the three remaining photos.