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About 2 months ago I was adding R13A to my AC in my 1980 229 El Camino. The AC was really blowing cold. But I noticed that while driving, whenever I let up on the gas like to turn a corner, there was a moaning sound coming from the engine compartment. In the driveway, I manually accelerated the engine and everytime I let off, it moaned. I swear the moaning was coming from the compressor. I talked to my mechanic and we planned to rebuild the AC system and replace the compressor. I did not have the finances and put it off. Today, I had on my to do list to check fluids since the car seemed harder to start. I checked the oil, ps fluid, and then took off the air filter to run some Sea Foam through. After doing this, I went to put the air filter back on. I somehow moved the vacuum hoses running from the cannister that splits to the carb base and to the pcv valve. The moaning stopped. I moved the hoses again and the moaning started. I saw that the vaccum line from the carb base was sucked flat. Then I saw that the pcv valve had come off the valve cover. I replaced the pcv valve in the cover, tightened the connections to the T of the vacuum lines and problem solved. The sound just happened to resolve itself in the vacuum hose crossing the AC compressor. AC is now good and moaning is gone. Unbelievable.
