When the door windows are closed, air is supplied to the passenger compartment by an electric fan. The intensity of air supply is regulated by the speed of rotation of the electric fan impeller. The fan motor has four speed modes (reduced speeds are provided by an additional resistor with two windings). Air is taken in through an air intake installed under the windshield frame. To clean the air entering the passenger compartment, a filter element made of non-woven synthetic material is installed on the air intake opening of the heater.
Extraction is achieved by creating a vacuum near the rear of the body when the vehicle is moving. The exhaust deflectors are built into the body panels under the rear bumper.
The interior is heated by a heater installed under the instrument panel. When the engine is running, heated fluid from the cooling system circulates through the heater radiator, heating the air passing through it. The amount of air passing through and around the radiator is determined by the central heater flap, depending on the position of the temperature control knob mounted on the instrument panel. The air distribution in the passenger compartment can be adjusted by turning the air distribution flap control knob, as well as by turning the flaps and guide blades of the instrument panel ventilation grilles.
Heater details:
1 - filter housing for the ventilation and heating system of the passenger compartment;
2 - filter element;
3, 4, 5, 6, 7 - air ducts;
8 - radiator and heater air distributor casing;
9 - heater radiator;
10 - heater electric fan casing;
11 - heater electric fan.