Vehicles without autocontrol system
If the coolant warning light flashes while driving, stop immediately:
1. Check coolant level (chapter Cooling system) and, if necessary, add coolant or water in small portions. Be careful when opening the cooling system sealing cap.
2. If the engine is too hot and the coolant level is normal, check if the viscous fan is spinning hard enough (noise resembling the operation of a turbine when gas is supplied?).
3. Car with electric fan: Does the fan rotate if the engine is too hot?
4. The radiator fan does not work despite the hot radiator.
5. Last possibility: the common sensor for the warning light and the coolant temperature indicator is faulty.
Troubleshooting
Coolant indicator light
1. Checking the control light: the control light flashes for functional control when the ignition is turned on. If this is not the case, then:
2. Check the appropriate fuse (chapter Electrical equipment).
3. If it is in order, then dismantle the combined instrument, dismantle the control bulb and check.
4. If the bulb is OK, check the wire and/or replace/repair the combined instrument panel.
5. Checking the temperature sensor on the engine: if the warning light also flashes when the engine is cold or when the engine is at operating temperature (with the engine running!), then the temperature sensor may be faulty. Read about its verification in this chapter above in the section Coolant temperature indicator.
6. Coolant level sensor in the expansion tank:
7. The sensor is inserted into the expansion tank from below and firmly connected to the tank.
8. With a flashing light, despite the correct coolant level, disconnect the sensor wires.
9. If the blinking stops, then clean the sensor inside in the tank or replace the tank.
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