The top hose between radiator and the engine connects to hose connector. In top ot this connector the temperature sensor is screw in. Disconnect the plug/plugs connected to the sensor. The pug with two wires control electric fan. The first stage if temperature rich 105C and second at 120C. The temperature sensor is close and electric fan works continuosly when car is on. You can drive car temporary with out this sensor and later replace with new one.

Roman
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86 420SEL 225K