A/C - Use of R-22 Refrigerant Not Recommended
87chevy30GMC NUMBER: 88-T-65
GROUP: 1B - Air Conditioning
DATE: December, 1987
CORPORATE
NUMBER: 861201
SUBJECT: R-22 REFRIGERANT
MODELS: ALL TRUCK MODELS
Use of R-22 refrigerant in any GMC truck A/C system is not recommended. R-22 refrigerant will not mix with the compressor lubricant currently used. Any mixture of R-12 and R-22 may cause the following to occur:
^ A/C compressor relief valve to blow at idle due to the build up of head pressures.
^ Loss of A/C system charge due to R-22 seeping through A/C hoses.
^ Compressor failure due to insufficient lubrication.
R-12 is the only refrigerant that should be used in GMC truck A/C systems.