HVAC System (Heater, Ventilator And A/C): General Description: Caution: Refrigerant

CFC-12 refrigerant cannot be used in a HFC-134a A/C system. HFC-134a refrigerant, also cannot be used in a CFC-12 A/C system.
If an incorrect or no refrigerant is used, it will result in poor lubrication and the compressor itself may be damaged.