14-27.1. AIR-CONDITIONING SYSTEM SERVICING (R-134a) (Cont'd)
g. Adding Lubricating Oil
It is not necessary to check or add oil as routine maintenance.
compressor, or receiver/dryer has been replaced or there was an
obvious oil leak. When a system is discharged, it is also
necessary to replace any oil carried out with the refrigerant.
Vehicle must be on level ground.
A new compressor is charged with 6 oz of lubricating oil.
If only the compressor is being replaced, drain and measure oil from compressor being replaced.
Drain new compressor and add the same amount of PAG lubricating oil as was drained from old
If there is a loss of refrigerant over a period of time and a component is being replaced to correct
leak, add lubricating oil to the component being replaced as follows:
Receiver/Dryer - 0.5 oz
When the system oil level is unknown, or system performance and efficiency are marginal, drain
and flush system and add a new 8-oz charge of PAG lubricating oil to the system.
FOLLOW-ON TASK: Lower and secure hood (TM 9-2320-280-10).