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How much oil?

kenimpzoom on Sun March 18, 2012 11:36 PM User is offline

Year: 1976
Make: Chevy
Model: Corvette
Engine Size: 350
Refrigerant Type: R12
Ambient Temp: 100

All the R12 leaked out of my system two years ago. I have been sweating it out they last two years, but want to get the AC working.

I plan on changing out all the o-rings and getting the VIR maintence kit.

Question, how much oil can I assume is left in the system? Do I have to remove the compressor and dump it out?

What is the reccomendation on getting this AC system back working. I have access to a vacuum pump and prefer to DIY.

Thanks, Ken

mk378 on Mon March 19, 2012 9:26 AM User is offline

Before taking anything apart, find the leak, see what is needed to repair it. If it's at zero pressure, small amounts of R-134a can be used to pressurize the system for leak testing. Do not run the compressor.

You will need a new drier. Changing the oil would not be a bad idea but not absolutely essential. Oil generally doesn't leak out, don't just add more assuming it needs it. Conduct a final pressure test on R-12 systems to be certain there's no leak before charging with R-12.

Edited: Mon March 19, 2012 at 11:10 PM by mk378

chris142 on Mon March 19, 2012 10:48 PM User is offline

If this Vette has an A6 compressor and you want to try R134a then you will need to drain the compressor. It has a sump. Personally I'm not happy with these older retrofits as the compressors seem to die soon after and they never really blow good and cold like r12 did.

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