Details of the ventilation and heating system: 1 - left side window heating duct; 2 - air duct for heating the windshield; 3 - radiator casing; 4 - air intake cover; 5 - heater radiator; 6 - heater valve; 7 - outlet pipe of the radiator; 8 - radiator inlet pipe; 9 - right side window heating air duct; 10 - deflector; 11 - air duct damper; 12 - air distribution cover; 13 - fan guide casing; 14 - electric fan; 15 - air distribution cover lever; 16 - fan casing; 17 - control rods; 18 - bracket for control levers; 19 - central air duct
The ventilation and heating system is used to create a comfortable microclimate in the car. Ventilation and heating of the interior 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 of the engine compartment and isolated from it by a rubber seal adjacent to the hood. In the air inlet box, rainwater is separated from the air and flows out, and the air is directed to the heater. The heater opening is closed with an air inlet cover. While the car is moving, part of the air through the air duct from the air intake box is diverted to the central air diffusers on the instrument panel.
The heater is located in the passenger compartment and consists of a radiator casing with an air intake cover, a guide fan casing and a fan casing with an air distribution cover connected together with spring clips. The heater is attached with four studs to the reinforcement of the partition of the engine compartment. 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 into the engine compartment and connected to the engine cooling system. The outlet of the branch pipes in the bulkhead of the engine compartment is sealed with a rubber seal, fixed with two self-tapping screws. A heater valve is built into the radiator inlet pipe, which regulates the flow of coolant. The crane is controlled by a flexible rod from the lever of the ventilation system control unit located on the instrument panel.
An electric fan is installed in the heater under the radiator. The fan motor with impeller is mounted on two elastic cushions in the guide casing. An additional resistor is built into the power supply circuit of the electric motor, which provides two fan speeds. The fan is turned on by a three-position switch on the instrument panel.
Air ducts depart from the fan casing, directing air both to the deflectors for blowing the side windows and to the upper air duct for blowing the windshield.
The air flow control of the heater is carried out by closing and opening the covers and air dampers of the heater. The air intake cover, the dampers of the windshield heating air duct and the side air ducts are controlled by flexible rods from the levers of the handles on the ventilation system control unit. The air distribution cover of the fan casing is controlled by a lever located on it.
The main malfunctions of the ventilation and heating system:
- leakage of a tap, heater radiator and pipes, and their connections;
- malfunction of the heater fan operating mode switch, damage to the wires and oxidation of their connections;
- failure of the electric fan.