Table of contents: Examination ↓ Replacement ↓
Warning! Proceed with the procedure only after the engine has completely cooled down! See also warnings at the beginning of the Section Antifreeze - general information. Remember that when the ignition is on, the cooling system fan may operate even when the engine is off.
Examination
1. The coolant temperature indicator system consists of a gauge mounted in the instrument panel and an information sensor located on the engine. The car is equipped with several CTS sensors, however, only one of them is used in the indicator system.
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2. If the meter detects overheating when the engine is clearly cold, check the wiring in the section of the circuit between the instrument panel and the sensor unit for signs of a short circuit to ground.
3. If the meter does not function at all (the arrow remains stationary even after 10 minutes of engine warming up) if the fuses are in good condition, turn off the engine and disconnect the wiring from the temperature sensor. Using a jumper wire, short-circuit the sensor wire to ground. Turn on the ignition briefly without starting the engine. If the indicator needle deviates to the end of the scale, replace the sensor.
4. To check the sensor, disconnect the wiring from it and connect an ohmmeter between the pin at the top of the sensor and the ground of the power unit. With a slightly warmed-up engine (about 60°C), the ohmmeter reading should be about 70÷90 Ohm for models up to 1998 and 170÷200 Ohm for models from 1999. After warming up the engine to a temperature of 100°C, the reading should drop to a value of (21÷24) / (47÷53) Ohm, respectively, otherwise replace the temperature sensor.
Replacement
Remove the sensor from the engine (prepare to collect spilled liquid) and quickly install a new one in its place, having first lubricated the threads with conductive sealant (not with teflon tape or FUM tape). Finally, check the coolant level.
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