The Nissan external temperature sensor on the first generation of Nissan is attached to the radiator and attached to the radiator. You can get to it by using a bonnet lock or lifting the grille. Next, disconnect from the power connector. There's some sort of hook on the hull that attaches to the bracket. The sensor should be pulled to the left and to the left. There's two hooks on the sensor. The sensor should be on a long hook.
