Cause | Remedy |
Too little coolant in the system | Fill the radiator to the marking, check the system for tightness |
Thermostat does not open | Check if the upper coolant hose is getting warm. If not, replace thermostat |
Coolant pump defect | Remove and check the pump |
Defective coolant temperature sensor | Check sensor |
Temperature gauge defect | Check Pointer |
Radiator cap defect | Carry out a pressure test (in the workshop) |
Loose coolant pump belt | Check and adjust belt tension |
The radiator fins are dirty | Blow out the radiator with compressed air from the engine side |
Radiator clogged with scale or rust | Replace radiator |
Clogged bleed pipe between coolant pump and cylinder head | Remove the tube and check its free permeability |
Fan viscous coupling defect | Check the clutch: turn the engine speed to 4000-4500 rpm As soon as the coolant temperature reaches 90-95°C, the fan speed will increase by 1000 rpm, which will be audible |