IN PREFERRED FORM, AN AUTOMOTIVE AIR-CONDITIONING SYSTEM HAVING A COMPRESSOR, A CONDENSER, AN EXPANSION VALVE, AN EVAPORATOR AND A FLOW REGULATING THROTTLING VALVE SERIALLY CONNECTED TOGETHER, RESPECTIVELY, AND INCLUDING AN EQUALIZER LINE BETWEEN THE EXPANSION VALVE AND THE THROTTLING VALVE OUTLET. THE EQUALIZER LINE IS NORMALLY BLOCKED BY A THERMALLY ACTUATED VALVE WHICH OPENS WHEN THE COMPRESSOR TEMPERATURE EXCEEDS A PREDETERMINED MAXIMUM. THE OPENING OF THE EQUALIZER LINE TRANSMITS COMPRESSOR INLET PRESSURE TO THE EXPANSION VALVE WHICH OPENS IT TO ALLOW REFRIGERANT TO FLOW THROUGH THE EVAPORATOR AND INTO THE COMPRESSOR FOR COOLING PURPOSES.