I have cold A/C in my 78 New Yorker! It is a low milage car (17K) and the system had not been tampered with and did not blow cold when I bought it. Right before covid I dumped two cans of R-12 in the system. It worked for a few days, not really good then quit again. We scoped it out and it was determined the system was full, but the expansion valve was bad. (Once removed, you could see rust deposits on the inner shaft). Replaced the dryer, the expansion valve, a few o-rings and fabricated a new hose for one that was bulging at one end. It was 90 F today in Chicago, we were running at 47 F in the Chrysler. Love Mopar engineering from the 70's. Something fun about having your windows up on a 80 F + day while younger cars have their windows down. If you are in the Chicago Area, you have to go to Lake Zurich Radiator; I have used them on all my "classic"cars. Now we have to wait for gas to come down from $4.90 a gallon. Our crap corn gas is hell in a 440 engine bay during high temps. One more thing off the list, wipers- check: where are the new door / glass seals being promised for years. ; )