33. Overheating
1. The coolant level has dropped.
2. The water pump drive belt is worn or damaged or its tension adjustment is broken
3. The internal channels of the radiator are blocked or dirty (blocked) radiator grille.
4. Faulty thermostat
5. Broken or cracked fan blades.
6. Faulty fan switch switch.
7. Faulty coolant temperature gauge.
8. Faulty water pump
34. Coolant does not reach operating temperatures
1. Faulty thermostat.
2. The readings of the coolant temperature meter are inaccurate.
3. The sensor-switch of the fan is faulty.
35. External coolant leaks
1. Damaged or destroyed as a result of aging of the material, the hoses or loosened their fastening on the fittings.
2. Damaged water pump seals - coolant oozes through the control hole in the pump housing.
3. There are leaks from the internal channels of the radiator or tank.
4. There are leaks from the engine drain plug or water gallery squeeze plugs.
36. Internal coolant leaks
Note: Internal coolant leaks are usually detected by checking the condition of the engine oil. Inspect the feeler blade and inside surfaces of the cover (lids) cylinders for traces of water and oil foaming.
1. There are leaks from the cylinder head gasket - check the cooling system with pressure.
2. There are cracks in the cylinder walls or in the head casting.
37. Loss of coolant occurs
1. Too much coolant has been added to the system.
2. The coolant boils away as a result of engine overheating.
3. There are internal or external coolant leaks
38. Coolant circulation interrupted
1. The water pump is not functioning properly. The easiest way to verify the operation of the pump is to pinch the upper radiator hose while the engine is idling. If a push of liquid is felt inside the hose when the hose is released, the pump is functioning properly
2. The patency of the cooling system is impaired - flush it and fill it with fresh liquid. If necessary, remove the radiator and backflush it
3. The water pump drive belt is worn or damaged or its tension adjustment is broken.
4. Stuck thermostat.
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