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.
Details of the ventilation and heating system: 1 - bracket for control levers; 2 - air intake cover control lever; 3 - heater tap control lever; 4 - flexible draft of the air intake cover; 5 - rotary deflector; 6 - air duct; 7 - air intake cover; 8 - heater radiator; 9 - radiator casing; 10 - branch pipe for draining coolant from the heater radiator; 11 - branch pipe for supplying coolant to the heater valve; 12 - heater valve; 13 - air distribution cover; 14 - fan impeller; 15 - electric motor; 16 - additional resistance; 17 - fan casing; 18 - air distribution cover lever; 19 - flexible draft heater tap
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 on two elastic cushions. 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 to two rotary deflectors for blowing the windshield and side windows.
The air flow control of the heater is carried out by closing and opening the covers. The air intake cover is controlled by a flexible rod from a lever on the ventilation system control unit. To make it easier to memorize the position of the levers of the control handles, there are symbols in the instrument panel in the form of triangles, the vertices of which indicate that the air intake cover and the heater cock 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 panel of the roof on the C-pillars, squeezes out the rubber valve and exits through the decorative grille on the side panel.
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.