Table of contents: Cars without automatic control system ↓ Troubleshooting ↓
Cars without automatic control system
If the coolant warning light starts flashing while driving, stop immediately:
1. Check the coolant level (chapter Cooling system) and, if necessary, add coolant or water in small portions. Be careful when opening the cooling system cap.
2. If the engine is too hot and the coolant level is normal, check if the viscous fan is rotating powerfully enough (noise reminiscent of a turbine when gas is supplied?).
3. Car with electric fan: Does the fan spin if the engine is too hot?
4. The radiator fan does not work despite the radiator being hot.
5. Last possibility: the common sensor of the control lamp and coolant temperature indicator is faulty.
Troubleshooting
Coolant warning light
1. Check the indicator light: The indicator light flashes for functional check when the ignition is turned on. If not, then:
2. Check the corresponding fuse (chapter Electrical equipment).
3. If it is OK, then remove the combination instrument, remove the indicator lamp and check.
4. If the bulb is OK, check the wire and/or replace/repair the combination meter.
5. Checking the temperature sensor on the engine: if the control lamp also flashes when the engine is cold or at operating temperature of the engine (with the engine running!), then the temperature sensor may be faulty. Read about checking it 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 is securely connected to the tank.
8. If the light is flashing despite the correct coolant level, disconnect the sensor wires.
9. If the flashing stops, clean the sensor inside the tank or replace the tank.
(A link to the original source is available on the website AudiManual.ru)