Component Description
WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
Water Valve
The water valve cuts the flow of engine coolant to the front and rear heater cores to allow for maximum cooling during A/C operation. It is controlled by the front air control through the water valve relay.
Courtesy of NISSAN MOTOR CO., U.S.A.