E46 series BMW 3

since 1998 of release

Repair and car operation

E46 series BMW 3
+ BMW 3 Cars (E46)
+ Current leaving and service
+ Engine
- Systems of cooling, heating
   + System of cooling of the engine
   - Heater and conditioner of air of salon
      Removal and installation of the control unit of the heater/conditioner
      Removal and installation of the fan of a heater
      Replacement of additional resistors of the fan of a heater
      Removal and installation of air deflectors
+ Power supply systems, injection and release
+ engine Electric equipment
+ RKPP and transmission line
+ Automatic transmission
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ electric equipment Schemes


Heater and conditioner of air of salon

Scheme of a contour of the conditioner of air of salon

1 — the fan
2 — the evaporator
3 — a throttle
4 — service accession of low pressure
5 — service accession of a high pressure
6 — a dehumidifier
7 — the condenser
8 compressor:

and — external air for condenser cooling
b — warm air, is taken away in environment
with — not cooled air passing through the fan of a heater
d — the cooled air arriving in salon
And — a high pressure (a coolant in a gaseous form)
In — a high pressure (a coolant liquid)
With — low pressure (a coolant liquid)
D — low pressure (a coolant in a gaseous form)

Heater. Models without the conditioner

1 — the fan
2 — a clip
3 — additional resistors
For separate steps of the fan
4 — the driving block right
5 — the microswitch
6 — transfer for adjustment a zaslonok
7 — a heating box
8 — a sealing frame
9 — sealing laying
10 — a fan cover
11 — the forward control panel

12 — the switch
For heating of back glass
13 — the fan switch
14 — draft
For temperature adjustment
15 — a bracket
16 — the roller
Drive airdistributing zaslonok
17 — a control unit casing
18 — the screw
19 — the handle

Heater. Models with the conditioner

1 — the fan
2 — a bracket
3 — a fan regulator
4 — the temperature sensor
5 — a drive of a zaslonka of ventilation
6 — a heater/conditioner box
7 — a ventilation zaslonka
8 — sealing laying
9 — a fan cover
10 — a sealing frame
11 — the screw, М4 x 14

12 — a lateral cover of a box of a heater
13 — a hose drainage
For the conditioner compressor
Additional heater of the diesel engine
14 — an additional heater
15 — the holder
16 — the console
17 — the M8 screw x 20, 24 H • m
18 — a nut
19 — a level
20 — the console

Holder of the compressor of the conditioner. Models 316i, 318i

1 — the compressor
2 — the holder
3 — a bolt, М8 x 55
4 — a bolt, М8 x 100

5 — the tension device
6 — the Torx screw, М8 x 55
7 — maple a belt

Fresh air arrives in salon through an airmodular box, the air filter of ventilation of salon and a fan casing. Air passes through a box of a heater and is distributed through various zaslonka on separate nozzles. Supply of air is defined by number of turns of the electric motor of the fan.
Depending on the established temperature in salon fresh air can go to the heat exchanger. The heat exchanger is located in a heating box and is warmed up by hot cooling liquid. Air passing through the heat exchanger heats up as a result of washing of plates of the heat exchanger and then arrives in salon. The thermal capacity of a heater is regulated by a consumption of cooling liquid. The electromagnetic valve on the liquid pipeline for this purpose serves.

The diesel engine
owing to higher efficiency has insignificant thermal productivity. Therefore installation of a separate heater which if necessary in addition warms up cooling liquid here is required. The additional heater is warmed with fuel from the separate fuel pump and if necessary is automatically connected.

Heating without the conditioner: The temperature in salon can be established by a regulator. By means of two other regulators the number of turns of the four-stage fan of a heater is established and air distribution on nozzles is made.

Conditioner: The temperature in salon is established by a key on the control panel and displayed on a digital board. According to it the electronic monitor of automatic equipment of the conditioner regulates opening of the crane of a heater depending on temperature in salon. Air temperature sensors in salon are in the control panel behind lattices for an input of air. Electronic regulation allows to maintain temperature some air in constant salon, irrespective of speed of the car and external temperature.

At turning on of the conditioner air at first is cooled, dried up and then depending on the established value of temperature again is warmed up.

If absorption of fresh air is not allowed, for example, at poor quality of external air, the system can be switched by pressing of the corresponding key to a circulation mode. Thus in salon internal air circulates.


At “Automatischer Umluft Control” inclusion (“Automatic control of circulation” - the special equipment) the system joins independently in a circulation mode as soon as in external air there are harmful components, for example, soot from combustion of diesel fuel. If quality of external air is again restored, the system is automatically switched to consumption of external air.

Operation of the conditioner

The conditioner works as the refrigerator: the compressor actuated from the electric motor, compresses a coolant in a gas phase, free from FCKW (R 134 and), and not putting harm to environment. The coolant is warmed up thus and goes to the condenser. There it is cooled and liquefied. Via the broad valve the coolant extends and arrives in the evaporator where owing to the low pressure evaporates. As a result of expansion process the air passing through system of pipes and plates outside, gives heat.

Thus, air is cooled, and moisture containing in it turns into condensate which is taken away out of car limits.

At the working engine and the switched-on fan in salon through various openings the cooled air can be brought. Intensity of cooling depends on the established temperature and number of turns of the electric motor of the fan.

The electronic monitor is built in an element of management of the conditioner.

In the conditioner the condensate removed out of limits of the car is formed. It is a normal mode and does not point to existence of any malfunctions in the car.

Conditioner repair here is not described. These works should be carried out in the conditions of a specialized workshop.

It is not allowed to open a contour of cooling of the conditioner as liquid hit on skin can cause frostbite.
At casual hit of liquid on skin immediately wash out a place of defeat by cold water within not less than 15 minutes. Liquid of the conditioner has no color and a smell and it is heavier some air. At leakages of cooling liquid there is a danger of poisoning in the lower part of the car (availability of liquid is not felt).