The compressor does make a slight humming noise uder normal operation, as stated before, it is difficult to tell if it is normal or not. If everything is working fine, I would not be too quick to throw parts at the car.
You are correct, it uses r-12, unless it has been converted.
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Ali Al-Chalabi
2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record
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