Cat® HVAC system provides heating, cooling and filtering of fresh and/or recirculating air in the operator compartment of a Cat® machine. Cat® Cab Air Conditioner Compressor pressurize fluid to maintain flow rate and increase pressure required for the application. The compressor is responsible for moving the refrigerant between the evaporator and condenser coils, ensuring that the refrigerant changes to gas or liquid as needed.Application:Cat® Cab Air Conditioner Compressors are used to circulate refrigerant throughout the HVAC system in Cat® heavy-duty equipment. Consult your owner's manual or contact your local Cat® Dealer for more information.