Automotive Air Conditioning Information Forum (Archives)

1yy07 on Tue June 21, 2011 4:54 PM

Year: 1979
Make: chevrolet
Model: corvette
Engine Size: 5.7
Refrigerant Type: r12
Country of Origin: United States

factory book says oil charge r4 6oz how much goes where

bromodragonfly on Tue June 21, 2011 5:41 PM

Brand new system - into the compressor.

Compressor replacement - drain old oil from compressor, add same amount of new oil into compressor.

R12/R134A Retrofit - assuming accumulator/drier has been changed and lines/cond/evap are free of any logged oil, you would drain compressor and add 6oz of new oil to it.



-------------------------
There is no knowledge that is not power

Dougflas on Tue June 21, 2011 7:59 PM

New R4's I put mineral oil in them (couple of oz), let it sit clutch down on bench, drink a beer, turn compressor a few turns, drain oil well, add proper amounr of ester oil. This will lube the seal. IT has worked for me for many years.

GM Tech on Tue June 21, 2011 10:40 PM

New R4s, I install PAG oil mixed with dye- mount compressor drink a beer while vacuum pump runs, charge it and run- never turn it, never worry about double lip seals-- works for me for over 20 years....

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......