Battery Zone Valve

Air Conditioning

Battery Zone Valve (Hybrid Only)

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

The battery zone valve will periodically be briefly opened during front (main) A/C operation for system maintenance. When A/C operation is not requested, the battery zone valve is closed.

When voltage is applied to the battery zone valve, it will be in the open state. When voltage is removed, the battery zone valve will be in the closed state. The battery zone valve will only be in the fully open or the fully closed state and cannot be partially opened.

The battery zone valve is mounted to the bottom of the auxiliary climate control housing.