BMW 5 Series E39

since 1996-2001 release

Repair and operation of the car

+ Introduction
+ Maintenance instruction
+ Current leaving and service
+ Engine
- Cooling systems, heating
   + Cooling system
   - Heater
      Removal and installation of the control unit of a heater or conditioner
      Removal and installation of the sensor of temperature of the control unit of a heater
   + Air conditioner
+ Power supply system and release
+ Engine electric equipment
+ Manual transmission
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Schemes of electric equipment
+ System of onboard diagnostics



General information

1 — the heater fan
2 — a bolt
3 — a final step of the fan
4 — the air temperature sensor in salon
5 — the sensor of temperature of the heating device
6 — a vacuum hose, black
7 — consolidation of accession of external air
8 — a ventilating branch pipe
9 — a gate drive cable
10 — a cable
11 — a fan cover
12 — the deflector of the heating channel
13 — a clip
14 — a bolt
15 — the heating fan
16 — a cover of heating elements

17 — the deflector of the heating channel
18 — a drive cable:
region of legs:
  And - green,
   With - green
   And - red,
   With - red
   And - blue,
   With - blue
19 — the drive of position of the gate
20 — the printed circuit board
21 — a peak
22 — the handle of distribution of a stream
23 — the handle of installation of temperature

External air for heating is sucked in through the soaking-up lattice of the case of the air filter which is under a windshield, and the fan moves in interior of the car. At the same time air passes through a heater box, and from there through separate nozzles comes to salon.

Control of a stream of air is exercised of the gates set in motion by cables. If the heater is established in the warm mode ("heat"), stream of air goes through a radiator. The radiator is in a box of a heater and is warmed with hot cooling liquid.

The passing stream of air heats up as a result of contact with plates of a radiator and comes to salon. Thermal productivity is regulated by a stream of cooling liquid for what the system has two electromagnetic valves in a cooling system contour.

Regulation of air temperature is carried out by the rotary handle, separately for the right and left half of salon. The electronic device in the control unit operates time of opening of cranes of a heater depending on temperature in salon. The sensor of temperature is located behind a heater box. Thanks to electronic regulation air temperature is maintained close to a constant, irrespective of the speed of the car and external temperature.

For strengthening of a thermal stream the heating fan having smooth regulation serves.