AC Oil and Charging Question

[Kilian]

Back with another AC question. I have the everything back together in my 83 GMC and it's holding a vacuum. Next step would be adding oil and R134a. I did not add any oil to the compressor when I installed it.

What's the best way to add the oil now? Crack the suction line to the compressor and pour in and then pull a vacuum again on the system? Or use cans of oil/R134a mix when charging?

I have a vacuum pump and manifold gauge set.

Thanks for the help!

 

[Finkaire]

New compressors typically come with PAG oil installed. If this is a retro-fit system you will need to drain the oil and install ESTER oil. Yes, you can add oil directly into the pump or the suction line.

 

[Kilian]

Thanks. The compressor is an A6 that I rebuilt and used Ester oil when reassembling. Evaporator, accumulator, and lines are all new so there shouldn't be any PAG to worry about. Condenser is original but cleaned out.