When the doors are closed, air is supplied to the passenger compartment by an electric fan. The intensity of the air supply is regulated by the speed of rotation of the electric fan impeller. The fan motor has four speed settings (lower speeds are provided by an additional resistor with two windings). Air intake is carried out 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 of the heater.
The hood is carried out due to the rarefaction that occurs near the rear of the body when the car is moving. Exhaust vents 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 core, heating the air passing through it. The amount of air passing through the radiator and bypassing it is set by the central heater damper, depending on the position of the temperature control knob installed on the instrument panel. The distribution of air in the passenger compartment can be adjusted by turning the air distribution dampers control knob, as well as by turning the dampers and guide vanes of the instrument panel ventilation grilles.
Heater details:
1 - filter housing for the ventilation and heating system;
2 - filter element;
3, 4, 5, 6, 7 - air ducts;
8 - casing of the radiator and heater air distributor;
9 - heater radiator;
10 - casing of the electric fan of the heater;
11 - heater electric fan.