Temperature Sensor
WARNING: This page is about a different car, the 1989 Nissan 240SX. However, it is still accessible from the selected car via links, so may be relevant.
With engine cool and idling, disconnect inlet vacuum hose at vacuum motor and ensure intake manifold vacuum is present at end of hose. If vacuum is not present or weak, check vacuum hose for leaks. If no leaks are found in vacuum hose, replace temperature sensor. After engine is warmed, ensure no vacuum is present. If vacuum is present, replace temperature sensor.