Car A/C Valves in Receiver System
The valves-in-receiver type system is another older General Motors design. The controls – expansion valve and pilot operated absolute suction throttling valve – are located in the same housing as the receiver-drier. This unit is mounted in the high pressure side between the condenser and the evaporator inlet.
Like the standard suction throttling valve type system, the valves-in-receiver (VIR) system requires continuous compressor operation whenever cooling is required. The VIR unit controls refrigerant flow to the evaporator and to the compressor.