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Should have a sticker on the radiator core support that shows how much it takes . But if your's is missing here
Refrigerant System Capacities
PAG Oil GM P/N 12378526 for United States
PAG Oil GM P/N 88900060 for Canada
* Add 60 ml (2 oz.) of PAG oil, plus the equal amount of oil drained from the accumulator.
The Delphi replacement compressor is precharged without PAG oil.
The Denso replacement compressor is precharged with 237 ml (8.0 oz) of PAG oil.
Evaporator, Rear Replacement
If more than the specified amount of PAG oil was drained from a component, add the equal amount of oil drained.
Total System PAG Oil Capacity
Total System PAG Oil Capacity with Rear A/C
Refrigerant Charge Utility with Front and Rear A/C
Refrigerant Charge Suburban with Front and Rear A/C
These use R134 -46oz and 13oz of oil. You need to pump down the system though once the oil is added and let it sit with the vacuum pump to remove any moisture. Any moisture left in the system will ruin your expansion valve and compressor quickly. Then add one can of R134 and run the system for a minute to distribute the oil. then add more R134 until the gauges show it at the right pressure for your ambient air .
There should have been a sticker on or around the accumulator with the specs.
Oil capacity is the amount drained from the old compressor, plus 3 oz. for the accumulator. Freon charge would be around 36oz or 3 cans.
You would put in 2 cans and then add until the pressure readings are within spec.
If there are any leaks in the system, they should be addressed first. The system needs to be recovered of any r-12 and remove the oil and the compressor oil. The accumulator (or receiver/dryer) needs to be replaced.
The system needs to have the proper amount of r134
compatable oil added back in. You can
measaure what comes out of the compressor and add that amount back in. Then add about one oz. per major component (condenser, evaporator, dryer). Ester oil is good for retro fitting because it is compatable with both oils. There are fittings you can buy (kit?) that screw onto your r-12 ports that allow you to evacuate and recharge it with r134-a. Typically, the new charge amount will be approximately 80 percent of the old charge. IE: if the vehicle held 3.75# of r-12 (x.8) is 3# of r134-a.