Fresh air enters the passenger compartment through the air intake grille under the windshield. In this case, the air passes through the air distributor housing and is directed by means of a damper system to the individual air nozzles. If the heating is set in operating mode «warm», cold air is directed to the heater core where it is heated. The radiator is located in the heater housing and is heated by hot coolant. The flowing fresh air is heated by the hot heat exchanger lamellas and then enters the vehicle interior. Heating has an air control mode, that is, the temperature is controlled by changing the composition of cold and warm air in the air mixture.
All outlets are adjustable. The dampers are controlled through cables.
The flow area for the coolant in the heat exchanger is controlled by a valve in the coolant outlet. The valve is activated by the temperature controller.
Depending on the set temperature, regulated outside air enters the passenger compartment through nozzles installed vertically and horizontally.
Air enters the passenger compartment through 2 nozzles on each side in the front footwell, 2 glass defroster nozzles, 2 side heated front door nozzles, and 2 middle and 2 side grilles.
To increase the performance of the heater, a fan with four control stages is designed. To ensure different fan speeds, ballast resistors are switched on at different stages.