Heater and air conditioning interior of the BMW 3 E46

Driving cabin air conditioner circuit
1 – fan
2 – evaporator
3 – choke
4 – low pressure service connection
5 – High pressure service connection
6 – Drier
7 – capacitor
8 – a compressor
and – the external air to cool the condenser
b – the hot air is discharged to the external environment
with – cold air passing through the heater fan
d – the cooled air entering the interior
A – high pressure (refrigerant in a gaseous form)
B – the high pressure (liquid refrigerant)
C – low pressure (liquid refrigerant)
D – low pressure (refrigerant in a gaseous form)

Heater. BMW E46 models without air conditioning
1 – fan
2 – Clip
3 – additional resistors
For individual fan stages
4 – drive unit right
5 – microswitch
6 – Transfer to adjust the dampers
7 – heating box
8 – a sealing frame
9 – gasket
10 – Fan Cover
11 – Front Control Panel
12 – the switch
For the rear window defogger
13 – the fan switch
14 – draft
To adjust the temperature
15 – Bracket
16 – Roller
Drive air distribution flap
17 – the cover of the control unit
18 – the screw
19 – the handle

Heater. BMW E46 models with air conditioning
1 – fan
2 – Bracket
3 – Fan Controller
4 – temperature sensor
5 – drive ventilation flaps
6 – a box of heater / air conditioner
7 – ventilation flap
8 – gasket
9 – fan cover
10 – a sealing frame
11 – screw M4 x 14
12 – side heater box cover
13 – the drain hose
For the air conditioning compressor
Additional heating of the diesel engine
14 – additional heater
15 – the holder
16 – Console
17 – screw M8 x 20 24 Nm
18 – a nut
19 – Strap
20 – Console

The holder of the air conditioning compressor. Models BMW E46 316i, 318i
1 – compressor
2 – the holder
3 – a bolt, M8 x 55
4 – bolt, M8 x 100
5 – tensioner
6 – screw Torx, M8 x 55
7 – V-belt

Fresh air enters the cabin through vozduhosbornuyu box, air filter, passenger compartment ventilation and fan shroud. The air passes through the heater box and is distributed through the various valves of individual nozzles. The air supply is determined by the number of revolutions of the fan motor.
Depending on the set temperature of fresh air in the cabin can be sent to the heat exchanger. The heat exchanger is located in the heating box and heated hot coolant. air passing through the heat exchanger is heated by the heat exchanger plate washer and then enters the interior. The thermal heater power is controlled flow of coolant. For this purpose the solenoid valve in the pipeline fluid.

Diesel engine because of the higher efficiency of the heat capacity is small. Therefore, it requires installation of a separate heater which heats the coolant further if necessary. Additional heater heated with fuel from a single fuel pump and automatically connect if necessary.

Heating with air conditioning: The temperature in the cabin can be mounted regulator. Through the other two controllers set the number of four-stage heater fan speed and air distribution is produced by the nozzles.

Air conditioning: The temperature in the cabin is set button on the control panel and displayed on the digital display. Accordingly, the electronic air conditioning automatic control unit controls the opening of the heater crane, depending on the temperature in the cabin. Air temperature sensors in the cabin are in the control panel behind the grilles for the air inlet. Electronic control allows you to maintain the interior temperature constant, regardless of the vehicle speed and outside temperature.

When the air conditioner is first cooled, dried, and then, depending on the set point temperature is heated again.

If fresh air intake is not allowed, for example, as a low outdoor air system by pressing the corresponding key can be switched to the circulation mode. In the cabin indoor air circulates.

When the “Automatischer Umluft Control” ( “Automatic control of circulation” – special equipment), the system is activated independently in recirculation mode as soon as the outside air appear harmful components, such as soot from diesel combustion. If the quality of the outside air is again restored, the system automatically switches to the external air intake.

conditioner Work
Air conditioning is available as a refrigerator compressor, driven by an electric motor compresses the refrigerant into a gas phase, free of FCKW (R 134 a), and will not harm the environment. Wherein the refrigerant is heated and sent to the condenser. There it is cooled and liquefied. After expansion valve expands the refrigerant enters the evaporator, where it evaporates due to its low pressure. As a result of the expansion process air flowing through a piping system and outside plates, it gives off heat.

Thus, the air is cooled, and the moisture contained therein is converted into condensate, which is allocated outside of the vehicle.

With the engine running and the fan is in the interior through the various holes can be supplied chilled air. cooling intensity depends on the set temperature and the number of revolutions of the fan motor.

The electronic control unit is integrated in the air conditioning control.

The air conditioner condensation output outside the car. This is normal and does not indicate any faults in the vehicle.

Repair of air conditioning is not described here. These works must be carried out in a specialist workshop.

It is not allowed to open the cooling circuit of the air conditioner, as the liquid in contact with skin can cause frostbite.
In case of accidental contact with the liquid on the skin, rinse immediately with cold water, place of defeat for at least 15 minutes. conditioner liquid is colorless and odorless and heavier than air. If coolant leaks there is a risk of poisoning in the bottom of the car (liquid presence is not felt).