Symptom | Possible reason |
Overheat | Dropped coolant level in the system (see chapter Car maintenance). |
The water pump drive belt is faulty, or the adjustment of its tension force is broken (see chapter Car maintenance). | |
The patency of the radiator is broken or its grille is blocked (see chapter Cooling system). | |
Faulty thermostat (see chapter Cooling system). | |
Radiator cap damaged and not holding pressure (see chapter Cooling system). | |
The setting of the ignition timing is violated (see chapter Ignition system). | |
hypothermia | Faulty thermostat (see chapter Cooling system). |
There are external coolant leaks | Hoses are damaged mechanically or as a result of aging of the material, or their fastening with clamps is loose (see chapters Car maintenance and Cooling system). |
Damaged water pump seal (see chapters Car maintenance and Cooling system). | |
Damaged radiator, heater heat exchanger or expansion tank (see chapter Cooling system). | |
The tightness of the drain plugs of the radiator / cylinder block is broken, or the squeeze plugs of the water jacket of the engine block are damaged (see chapters Engine and Cooling system). | |
There are internal coolant leaks | Broken cylinder head gasket (see chapter Engine). Cracked cylinder head or block (see chapter Engine). |
Loss of coolant occurs | Too much liquid has been added to the system (see chapter Car maintenance). |
The coolant boils off due to engine overheating. | |
There are external or internal coolant leaks (see above). Faulty radiator cap (see chapter Cooling system). | |
Coolant circulation interrupted | Faulty water pump (see chapter Cooling system). |
Cooling system blocked (see chapters Car maintenance and Cooling system). | |
The water pump drive belt is faulty, or the adjustment of its tension force is broken (see chapter Car maintenance). | |
Stuck thermostat (see chapter Cooling system). |