The climate control system is a modular system. By adding or replacing units, the basic version can be transformed into other versions: with semi-automatic or automatic control, additional heating.
The cabin filter is located in a slot between the intake fan and the air flow distributor. It can be replaced from the cabin. To remove the filter, you need to remove its cover (sliding latches). To remove the ballast resistor of the fresh air fan N₂4 on vehicles without air conditioning, it is necessary to remove the glove compartment. After disconnecting the connector, the ballast resistor is removed by turning it counterclockwise. On vehicles with air conditioning, the ballast resistor is missing. The fresh air fan is controlled by the J126 unit. To replace this unit, it is necessary to remove the glove compartment and the fresh air fan.
(This article was copied from an online resource: AUDIMANUAL.ru)