Cause | Elimination Method |
| Too little coolant in the system | The expansion tank must be filled completely up to the marking. Check the tightness of the system |
| Coolant thermostat does not open | Check if the upper radiator hose is warm. If not, check thermostat, replace if necessary |
| Faulty water pump | Remove and check water pump |
| Faulty coolant temperature gauge sensor | Check sensor |
| Faulty coolant temperature gauge | Check the operation of the device at the service station |
| Expansion tank cap defective | Carry out a pressure test at the service station |
| Water pump V-belt too loose | Check and adjust tension |
| Radiator cooling fins dirty | Blow out the radiator with compressed air from the engine side |
| The radiator is clogged inside with deposited scale or rust. The radiator is warm only at the top, the lower radiator coolant hose does not get hot | Replace radiator |
| Electric fan not working | Check the reliability of the electrical contacts on the temperature sensor and on the fan motor. Check temperature sensor. Check the wiring according to the wiring diagram, if necessary, replace the electric motor |
| The temperature sensor of the circulation pump is faulty | Check the temperature sensor of the circulation pump |
Diagnosis of malfunctions of the cooling system
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Previous articles
Coolant circulation temperature sensor
Fan motor temperature sensor — check
Water pump — removal and installation
Coolant thermostat — removal, inspection and installation
Coolant replacement
Removal and installation of a radiator
Radiator and antifreeze — design description
Coolant circulation
Checking the pressure in the engine cooling system
Coolant circulation temperature sensor
Fan motor temperature sensor — check
Water pump — removal and installation
Coolant thermostat — removal, inspection and installation
Coolant replacement
Removal and installation of a radiator
Radiator and antifreeze — design description
Coolant circulation
Checking the pressure in the engine cooling system
Next articles
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