When the door windows are closed, air is supplied to the passenger compartment by an electric fan. Air is taken in through air intake grilles 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 casing of the heater electric fan. Three operating modes are provided to regulate the intensity of air supply by the electric fan.
The exhaust is carried out due to the vacuum that occurs near certain areas of the body when the car is moving. The exhaust deflectors are built into the rear ends of the side doors.
The interior is heated by a heater located under the instrument panel. When the lower lever of the ventilation and heating system control unit is moved to the red sector, the heater valve opens and its central flap moves. Heated liquid from the engine cooling system begins to circulate through the heater radiator, heating the air passing through it.
When the lower lever of the ventilation and heating system control unit is moved to the blue sector, the heater radiator valve closes the flow of liquid through the heater radiator, and the central flap, closing, directs the flow of liquid around the radiator. If the lever is at the intersection of the red and blue sectors, then part of the air flow passes through the heater radiator, and part - along the bypass path.
The two upper levers of the ventilation and heating system control unit distribute the air flow throughout the car's interior. The left lever regulates the distribution of the air flow to the driver's and passengers' feet and to the central ventilation grilles of the instrument panel. The right lever regulates the intensity of the windshield and front door glass blowing. Additionally, part of the flow can be redistributed using the guide blades of the ventilation grilles.
[The source is on the website www.VazBook.ru]