Auxiliary Isolation Valve
WARNING: This page is about a different car, the 2018 Land Rover Range Rover and 2017 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.
The auxiliary isolation valve is a combined solenoid operated shut-off valve and block-type thermostatic expansion valve attached to the inlet and outlet pipes of the evaporator. The ATCM controls the operation of the shut-off valve to isolate the auxiliary climate control assembly from the remainder of the Air Conditioning (A/C) system.