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Temperature Sensor

With engine cool and idling, disconnect inlet vacuum hose at vacuum motor and ensure intake manifold vacuum is present at end of hose. See Fig 1 . If vacuum is not present or vacuum is weak, check vacuum hose for leaks. If no leaks are found in vacuum hose, replace temperature sensor. After engine is warmed up, ensure no vacuum is present. If vacuum is present, replace temperature sensor.

Fig 1: Automatic Temperature Control (ATC) Vacuum Motor
G121291Courtesy of NISSAN MOTOR CO., U.S.A.