For heating, fresh air is sucked in under the windshield and, passing through the fan, is directed into the passenger compartment. In this case, the air blows over the heating radiator and through various flaps is divided into outlet nozzles. The flaps for air distribution are controlled by the vacuum regulator. The vacuum hoses from the air distribution switch to the vacuum regulators are colored. so as not to confuse them. If the heating is set to "heat". The warm air valve opens and cold air passes through the heat exchanger. The heat exchanger is located in the heater body and is heated by hot coolant. The flowing fresh air is heated by the hot plates of the heat exchanger and then enters the passenger compartment. The warm air valve is driven by the warm air regulator using a Bowden rod. A four-stage heating fan is used to increase heating. Changing the fan speed is achieved by connecting it to resistors of different ratings. If any of the resistors is faulty, the fan motor does not rotate at this stage.
Schematic representation of vacuum controlled heating:
1 - Air recirculation magnetic valve
2 - Vacuum regulator for air duct in footwell
3 - Vacuum regulator for air pipe, defrosting glass
4 - Air separation switch
5 - Low pressure receiver
6 - Vacuum regulator for recirculation valve/inlet valve
7 - Bypass line valve
8 - Connecting vacuum from the engine
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