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I am very interested to hear how this turns out. I have a similar problem on a 1974 Big Block. There are various postings in the archives.
The short version is the system was open when I purchased the car several years ago. I purchased a rebuilt Delco A6 Compressor and a rebuilt VIR. The system was cleaned out (by local Corvette oriented Chevrolet Dealer) and charged with R12.
What turned out to be occasional belt squeal is now a major belt squeal beginning at 2,000 RPM. I have followed many suggestions but, at this time I have removed the belt. I still have the original compressor and VIR. I'm considering sending these out for as rebuild and starting all over.
I have also noticed some continuing squeal without the AC belt. I have tried to localize the noise without success by removing other belts one at a time... AIR Pump, Alternator, Power Steering.
As you can imagine there is a lot of noise in the engine compartment on a big block car. The clutch fan makes one helluva roar. I suspect the idler pulley may be bad as a result of over torque from the ac belt. I have a new one to install... maybe this week.
I don't think this will solve the ac problem and have reconciled myself to another summer without AC.
Please contact me direct if you want to compare notes.
The short version is the system was open when I purchased the car several years ago. I purchased a rebuilt Delco A6 Compressor and a rebuilt VIR. The system was cleaned out (by local Corvette oriented Chevrolet Dealer) and charged with R12.
What turned out to be occasional belt squeal is now a major belt squeal beginning at 2,000 RPM. I have followed many suggestions but, at this time I have removed the belt. I still have the original compressor and VIR. I'm considering sending these out for as rebuild and starting all over.
I have also noticed some continuing squeal without the AC belt. I have tried to localize the noise without success by removing other belts one at a time... AIR Pump, Alternator, Power Steering.
As you can imagine there is a lot of noise in the engine compartment on a big block car. The clutch fan makes one helluva roar. I suspect the idler pulley may be bad as a result of over torque from the ac belt. I have a new one to install... maybe this week.
I don't think this will solve the ac problem and have reconciled myself to another summer without AC.
Please contact me direct if you want to compare notes.