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If I understand correctly, do the radiator fans sometimes run, and sometimes not?
If so, the fuse can be excluded.
The question then is, what does the temperature display in the speedometer show? If the temperature there also rises above 90°, or drops at the moment of boiling the water, then a workshop should check the wiring between the cooling fan and the control unit. The fan module may not be controlled correctly.
However, if the temperature display does not even go to 90° or remains at 90° even with boiling radiator water, the temperature sensor for the coolant must be replaced.
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