Auto A/C Terms - Glossary
Evaporator Pressure Regulator Valve - EPR Valve

Early Chrysler Corporation A/C systems utilized EPR valves to maintain the proper refrigerant pressures in the evaporator. The ERP Valve was a device that regulated evaporator pressures creating a back pressure.

Located in the rear suction port of the Chrysler RV-2 A/C Compressor, this system design has been replaced with more current designs using cycling clutch compressor and pressure sensing switches located in the low pressure lines of the A/C system.