System Operation

The intake door control judges intake door position based on the ambient temperature, the intake air temperature and the in-vehicle temperature. When shifting mode position D/F, when the DEF or OFF switches are pressed, or when A/C switch is OFF, the unified meter and A/C amp. sets the intake door at the FRE position.

Door Motor Circuit

Fig 1: Door Motor Circuit Diagram

Courtesy of NISSAN MOTOR CO., U.S.A.

Intake Door Control Specification

• Intake door position is basically fixed at FRE when FRE indicator of intake switch is ON or DEF switch is ON.
• Intake door position is basically fixed at REC when REC indicator of intake switch is ON.
• Intake door automatic control selects FRE, 20 - 80% FRE, or REC depending on a target air mix door opening angle, based on in vehicle temperature, ambient temperature, and sunload.

Fig 2: Intake Door Control Temperature Graph

Courtesy of NISSAN MOTOR CO., U.S.A.