Coolant temperature gauge and sensor (Peugeot 305)

1. If the coolant temperature gauge gives incorrect readings, then you should check the gauge itself, the temperature sensor, the connecting wiring and the contact points.

2. First check that the wires are not broken and the contacts are clean and not rusty. The temperature gauge and temperature sensor cannot be repaired and must be replaced if faulty.

3. The wiring can be checked by directly connecting the temperature sensor and the temperature gauge with an auxiliary wire. Start the engine (checking that the disconnected wires do not touch the fan) and check how the temperature gauge works. Alternatively, the wires can be tested for continuity using a multimeter or test light.

4. The best way to check the temperature sensor is to try replacing it. The sensor is located immediately in front of the thermostat housing on the upper left side of the cylinder block. Before removing the sensor, partially drain the coolant (see section 2) and disconnect the power wire from the sensor. Unscrew the sensor.

5. Installation of the new sensor is carried out in reverse order. Fill the cooling system with liquid (see section 4).

6. The procedure for removing and installing the temperature gauge is given in chapter 10.