Air Inlet Control
WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
The intake door position is automatically controlled in MAX A/C (REC) and DEF (FRE) modes. The intake door is controlled by customer input in the other modes, unless certain conditions apply. If heat has been selected, and the ambient temperature is low, the front air control will command the intake door to partial recirculation to speed up the heating of the heater core. If the evaporator fin temperature is too high, the front air control will command the intake door to partial or full recirculation, as needed, to help cool the evaporator.