Heating system. General information (BMW 3 Series E30)

Fresh air enters the car through the air intake grille under the windshield. The air passes through the air distributor housing and is directed by a system of flaps to individual air nozzles. If the heating is set to the "heat" mode, cold air is directed to the heater radiator, 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 lamellas of the heat exchanger and then enters the car. The heating has an air control mode, i.e. the temperature is regulated by changing the composition of cold and warm air in the air mixture.

All outlets are adjustable. The flaps are controlled by cables.

The flow section for the coolant in the heat exchanger is controlled by a valve in the coolant outlet channel. The valve is activated by the temperature regulator.

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 vents on each side in the front footwell, 2 defroster vents, 2 side vents for heating the front door windows, as well as 2 middle and 2 side grilles.

To increase the heater's performance, a fan with four control stages is designed. To ensure different fan speeds, ballast resistors are included at different stages.



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