Heating and ventilation (BMW 5 Series E34)

Intake of heated air (levers 1 and 3)

Heated air is supplied through air supply nozzles to the windshield and side windows, as well as through outlets in the lower part of the cabin at the front and rear.

Outside air intake (lever 2)

Outside air enters through guides and metering grilles in the middle of the instrument panel and in the front doors, as well as through a metering grille on the upper side of the instrument panel.

Air supply to the rear seat*

Air flows through guides and metering grilles in the rear of the center console, regardless of the position of lever 2.

• 1 - Upper cabin air supply lever
• 3 - Lever for supplying air to the lower part of the cabin

You can smoothly adjust the air distribution.

• The extreme left position of the levers means that the air supply is blocked.
• The extreme right position of the levers means that the air supply is completely open.

Lever 3 - when there is no need to defrost the windows - always keep it open approximately halfway so that the temperature sensor of the heater regulator can work correctly.



4, 6 - Left and right side temperature rotary controls

The temperature in the cabin is set by turning the regulator to the desired position (the temperature in degrees Celsius is indicated on the circular scale). The set temperature is quickly reached after the engine is started and usually remains unchanged, as it is maintained by an electronic regulator.

To avoid large temperature fluctuations and excessive load on the heating system, turn the regulators gradually.

In the extreme right position of the regulator on the driver's side, automatic temperature control does not occur on either the left or right side, and the heater operates at full power. If the electronic temperature sensor fails, also set the regulator to this position.

2 - Outside air supply control lever

• The extreme left position of the lever means that the air supply is blocked. The extreme right position of the lever means that the air supply is completely open.

Each grille can be independently adjusted to the desired position, air flow is controlled by ribbed rollers. The grille on the upper side of the dashboard is adjusted for indirect moderate ventilation.

Ventilation of the rear part of the passenger compartment is carried out regardless of the position of lever 2.



Thanks to independent heating of the lower part of the passenger compartment, optimal temperature distribution by height is achieved: "warm feet - cool head".



5 - Fan control switch

Position "0": the fan is off, there is no forced air supply.

Turn the switch to the right (with output from a fixed position) includes low fan speed and minimum air flow.

Further turning to the right increases air flow slightly without significantly increasing fan speed.

When you turn the regulator from position "2" to position "4", the fan speed increases.

For the electronic temperature sensor-regulator to operate correctly, the fan regulator must be set to at least the vertical position ("12 o'clock").

Your car has a quick-defrost feature for the windows.

7 - Switches for setting the fast heating mode of the windows

The maximum effect is achieved only when the engine is warm.

Glass fogs up due to the difference in temperature between the outside and inside of the car or due to high humidity in the car interior (condensation forms). In this case, the only way to quickly eliminate condensation is by intensively supplying hot air directly to the glass.

[The original text of the article is available on the resource «BMWman.ru»]