Diagnosis of malfunctions of the heating system
Cause | Elimination Method |
Heating fan does not rotate | |
Fan motor fuse blown. | Check fan fuse, replace if necessary. |
Faulty fan switch. | Check if voltage is applied to the fan motor. If not, remove and check the switch. |
Motor defective. | Replace fan motor. |
The heating fan does not rotate at one of the speed levels | |
Defective additional resistance | Replace additional resistance. |
Heating power too low | |
Coolant level too low | Check the coolant level, top up if necessary. |
Heating valve does not open | Check the solenoid valve in the water access system, make it passable. |
Leaky or clogged heat exchanger | Replace heat exchanger (repair shop job). |
The heated air has a sweet smell, when the heating is turned on, the windows fog up | |
Heat exchanger leakage | Check the cooling system for leaks. Replace heat exchanger (repair shop job). |
Noise during operation of the heating fan | |
Fan contamination | Remove the fan, clean the air channel. |
Fan impeller imbalance, bearing failure | Remove the fan motor and check for ease of rotation. |