Fan not working
Fan motor fuse blown
Check fuse, replace if necessary.
Faulty fan switch
Remove and check the switch.
Faulty fan motor
Check if voltage is being supplied to the blower motor with the ignition on and the blower switch on. If yes, replace the motor.
Heater fan only works at one speed
Additional resistance defect
Replace board with additional resistors.
Low blowing air temperature
Low coolant level
Check the coolant level in the expansion tank. Top up if necessary.
The heater rods are difficult to move or they are faulty
Check the traction. Replace if necessary.
Clogged cabin filter. Replace it.
The heater core is leaking or it is clogged
Replace heater core (work is done in the workshop)
The heater does not turn off
Heater cable damaged or out of adjustment
Adjust or replace the traction cable.
Noises in the fan
Dirt, leaves
Remove and clean the fan, clean the air duct.
Fan impeller imbalance, defective bearing
Remove the fan and check for ease of movement.
The air from the fan has an unpleasant smell. Windows fog up when ventilation is turned off
Heater leakage
Check the pressure cooling system for leaks (work is done in the workshop). If coolant leaks from the heater housing, replace the heater.