Passenger Zone Valve

Air Conditioning

Passenger Zone Valve (Hybrid Only)

The passenger zone valve is a solenoid-type valve used on hybrid vehicles to isolate the front (main) evaporator core from the refrigerant system when the A/C compressor is operating for HVTB cooling and A/C operation has not been selected for the passenger compartment. When A/C operation has been selected for the passenger compartment, the passenger zone valve will also be closed to prevent freezing of the front evaporator core if the front evaporator discharge air temperature sensor indicates that the front evaporator temperature has fallen below acceptable levels, while the auxiliary evaporator discharge air temperature sensor is reading within acceptable levels. This is done to prevent the A/C compressor from having to be cycled off when HVTB cooling is still required.

When voltage is applied to the passenger zone valve, it will be in the open state. When voltage is removed, the passenger zone valve will be in the closed state.

The passenger zone valve will only be in either the fully open or the fully closed state and cannot be partially opened.

The passenger zone valve is mounted at the top of the RH shock tower.