Check coolant level (chapter «Cooling system») and add coolant or water if necessary.
If the engine is hot and the coolant level is correct, check if the electric cooling fan is running with the ignition on. If it stays, despite the hot engine, you need to refer to the list of malfunctions for the cooling fan (chapter «Cooling system»).
Last possibility: one of the two sensors of this indicator is faulty (see next section).
Troubleshooting the coolant indicator
Indicator test: When the ignition is turned on, the coolant indicator flashes to check the operation. If this does not happen:
Check the appropriate fuse (chapter «Body electrical system»).
If it is working, you should remove the instrument cluster, remove and check the indicator.
If the light bulb is in order, you need to check the wire or replace the mini-system unit (see section «Disassembly» in this chapter).
Checking the temperature sensor in the motor unit: if the indicator flashes even when it is cold or at normal operating temperature (working) engine, the temperature sensor may be faulty.
Disconnect the multi-pin plug at the temperature sensor: the lamp should go out.
Wire to coolant indicator (the illustration on page 236 shows which indicator it is) lead to «mass»: The light should flash again.
If this happened in both cases, then the light bulb is working; then the cause should be sought in the sensor or wiring. Check or replace. Or the coolant level sensor.
Checking the coolant level sensor in the expansion tank: the sensor is installed at the bottom of the compensation tank and is rigidly connected to it.
If the indicator flashes despite the correct fluid level, disconnect the wire from the sensor.
If after that the flashing stops, you need to clean the sensor inside the tank or replace the tank.
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