Fig. 3.80. Location of the coolant temperature sensor (1) and the air bleed nipple (2) on the thermostat housing
The sensor is installed in the thermostat housing (see fig. 3.80). It is a resistor with a negative temperature coefficient of resistance, i.e. as the temperature of the liquid increases, the electrical resistance of the sensor decreases (Table 3.6).
Table 3.6. Sensor resistance dependence on temperature
Verification procedure:
- if the coolant temperature gauge needle in the instrument cluster constantly shows a low temperature, although the engine is warm, disconnect the contact connector from the sensor and connect it to the "ground" - a metal part of the engine. With the ignition on, the needle should move to the high temperature area on the instrument. Otherwise, the faulty sensor must be replaced. If the needle does not move even when the wire is connected to the "ground", remove the instrument panel as described in the section "Body", and check the condition of the circuit between the sensor connector and the device, as well as the power supply to the device. If the circuit is in good condition and voltage is supplied, the device is faulty and must be replaced;
- if the instrument needle shows a high temperature when the engine is cold, disconnect the connector from the sensor. If the needle returns to the low temperature area when the ignition is on, the sensor is faulty. If the needle still does not move, check the circuit condition as described earlier.
Removal procedure:
- drain some of the coolant as described above;
- disconnect the contact connector and unscrew the sensor.
Install in the reverse order of removal, apply sealant to the sensor threads.
You can find the original at this link www.renaultbook.ru