Description of the ventilation and heating design (VAZ-2106)

The ventilation and heating system serves to create a comfortable microclimate in the car. Ventilation and heating of the cabin are provided by air taken from outside. Air enters the system through the grille openings of the hood into the air intake box located in the rear part of the engine compartment and isolated from it by a rubber seal adjacent to the hood. In the air intake box, rainwater is separated from the air and flows out, and the air is directed to the heater. The heater opening is closed by the air intake cover.

The heater is located in the passenger compartment and consists of a radiator casing with an air intake cover, a fan guide casing, and a fan casing with an air distribution cover, connected together with spring clips. The heater is attached with four studs to the engine compartment bulkhead reinforcement. The junction of the heater with the body is sealed with a rubber seal.





If necessary, the air passing through the heater is heated by a liquid radiator located in the casing. The inlet and outlet pipes of the radiator are led out into the engine compartment and connected to the engine cooling system. The opening of the outlet pipes in the bulkhead of the engine compartment is sealed with a rubber seal, secured with two self-tapping screws. The heater valve is built into the inlet pipe of the radiator, regulating the flow of coolant. The valve is controlled by a flexible rod from the lever of the ventilation system control unit, located on the instrument panel.

[The original is on the portal VAZBOOK]

An electric fan is installed in the heater under the radiator on two elastic cushions. An additional resistor is built into the electric motor power supply circuit, providing two fan rotation speeds. The fan is switched on using a three-position switch on the instrument panel.

Air ducts extend from the fan housing, directing air to two rotating deflectors for blowing air onto the windshield and side windows.

The heater air flow is controlled by closing and opening the covers. The air intake cover is controlled by a flexible rod from the lever on the ventilation system control unit. To make it easier to remember the position of the control levers, there are triangle-shaped symbols on the instrument panel, the tops of which indicate that the air intake cover and the heater valve are closed. The air distribution cover of the fan casing is controlled by a lever located on it.


Air from the passenger compartment is diverted under the upholstery of the inner side roof panel on the rear pillars, presses the rubber valve and exits through the decorative grille on the side panel.

Main faults of ventilation and heating systems:

• leakage of the tap, heater radiator and pipes, and their connections;
• malfunction of the heater fan mode switch, damage to the wires and oxidation of their connections;
• failure of the electric fan.