- Slow drop in coolant level. Small amounts of coolant enter the combustion chamber. This can take quite a long time.
Attention! A similar situation can also be observed with a leak in the cooling system.
- On a warm engine, a white plume of gases enters from the exhaust pipe. Significant loss of coolant. The coolant enters the combustion chamber in large quantities and evaporates there, leaving with the exhaust gas.
- When the engine is running, air bubbles come out of the open expansion tank. The coolant in the radiator boils and splashes. The products of combustion are squeezed out into the cooling system.
- The surface of the coolant is colored iridescent or black. Oil from the lubrication system enters the cooling system.
- A gray or brown emulsion remains on the dipstick or there are droplets of coolant in the oil. Coolant enters the lubrication system. Attention! The presence of liquid in the oil can damage the bearings. Replace the cylinder head gasket immediately. Do not start the engine.
Thermostat defect
The coolant temperature gauge needle deviates slowly. The engine warms up more slowly, and the heater does not reach the required power. Thermostat valve poppet stuck open (for example, due to deposits) and the channel to the radiator is constantly open.
- This is not particularly dangerous, but the thermostat should be replaced without delay.
The arrow of the temperature gauge, despite the fact that the coolant level in the expansion tank is normal, is rejected to the limit to the right. The coolant temperature warning light flashes. The radiator and its lower hose are cold.
- Thermostat plate blocked (possibly due to a defective thermostat gasket). The movement cannot be continued, the engine may overheat. Replace thermostat immediately.
The arrow of the temperature gauge is rejected to the limit to the right. Coolant temperature warning light flashes
Only 4-cylinder engines. The V-belt is loose or broken.
- Check the belt tension or replace it Insufficient amount of fluid in the cooling system
- Add coolant
Temperature sensor wire shorts to «mass» (-).
- Disconnect the wire from the temperature sensor. The arrow should move back and the red lamp should go out, otherwise check the wire.
Thermostat not letting fluid out of radiator (radiator cold).
- Remove the thermostat and move without it or in tow The radiator fan does not turn on.
- Faulty electric fan. Check the radiator fan.
Defective safety valve in the cap of the expansion tank.
- Check or replace expansion tank cap. Defective coolant temperature gauge stabilizer.
- Replace stabilizer.
Clogged radiator fins.
- Clean out the radiator.
The coolant temperature gauge reacts poorly to temperature rise, and the heater does not reach the required power
The thermostat does not close completely and the heated coolant enters the radiator earlier.
- Clean or replace thermostat
The arrow of the coolant temperature indicator almost does not deviate. The heater operates at normal power
Defective coolant temperature gauge stabilizer.
- Replace Stabilizer
Defective coolant temperature gauge sensor.
- Replace sensor
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