Audi A4, S4

since 2000 of release

Repair and car operation



Audi A4, S4
+ Introduction
+ Governing bodies and receptions of safe operation
+ Current leaving and service
+ Engine
- Systems of cooling, heating and air conditioner
   + cooling System
   - Systems of ventilation, heating and air conditioning
      General information and security measures
      Removal and installation of the air snuffled
      Removal and installation of the electric motor of a drive of a ventilating zaslonka
      Removal and control unit installation by the heater/conditioner
      Removal and installation of the electric motor of a drive of the fan of a heater and conditioner
      Removal and installation of the sensor of temperature of external air
      Removal and installation of an additional heating element
+ Power supply systems, release and decrease in toxicity of the fulfilled gases
+ Systems of electric equipment of the engine
+ Manual box of gear shifting
+ Automatic transmission
+ Coupling, power shafts and differential
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment


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Systems of ventilation, heating and air conditioning

General information and security measures

Scheme of a contour of the conditioner of air

1 — the Fan
2 — the Evaporator
3 — the Broad valve
4 — the Tank
5 — the condenser Fan
6 — the Condenser
7 — the Compressor
and — External air for condenser cooling

b — the Warm air which is taken away outside
with — not cooled air going through the fan
d — the Cooled air going to salon
And — the High pressure, gaseous
In — the High pressure, liquid
With — Low pressure, liquid
D — Low pressure, gaseous

The heater case with the heat exchanger and an additional heater

1 — the Heater
2 — the Pipe of return of cooling liquid
3 — the Pipe of supply of cooling liquid
4 — the Holder of pipes of cooling liquid
5 — the Bolt
6 — the Cover for pipes of cooling liquid
7 — Collars

8 — the Sealing ring, surely replace
9 — the heater Heat exchanger
10 — the Cover (cars without an additional heating element). The cover corresponds to a cover of an additional heating element, passes for the tip are closed tightly
11 — the Additional heating element. Only the diesel models which have not been equipped with an additional heater, working at fuel
12 — the Stopper
13 — the Stopper
14 — the Stopper. Condensate removal at cars with the conditioner

Elements of central air of air of salon

1 — the Fan of an extract of air
2 — the To/in Compressor
3 — the To/in Coupling
4 — Kondensor
5 — the Sensor of temperature of air
6 — the pressure Sensor To/in
7 — the Accumulator

8 — Spuskna the valve of assembly of the evaporator
9 — the Limiter
10 — the Valve of a high pressure
11 — the Valve of low pressure
12 — Zaslonka of giving/air circulation
13 — the air temperature Sensor in an inlet air line
14 — the Filter

Removal of the evaporator of the conditioner of air

1 — the Latch
2 — a heater Casing To/in
3 — the Latch
4 — Zaslonka of giving/air circulation
5 — the Grid of an inlet air line

6 — a heater Radiator
7 — the Central zaslonka
8 — Zaslonka of heating of a foot well
9 — Zaslonka of temperature adjustment

Address also to the Section Heater, ventilation and the air conditioner.

Works with central air should be carried out by experts.

Fresh air for system of heating and ventilation is sucked in by the electrofan. Before receipt in salon air is cleared by filters of rough and thin cleaning.

The conditioner of air is capable as to warm up (in a heater radiator) and to cool (in the conditioner evaporator) and to drain air arriving in salon. In the crude weather, arriving fresh air previously it is cooled, then again heats up to the set temperature. Thus there is a condensation of excessive moisture of air, i.e. its drainage. Thus the zapotevaniye of glasses is eliminated.

Then air is distributed on ventilating nozzles in car salon.

Through a heater radiator constantly there passes hot cooling liquid of system of cooling of the engine. For regulation of a consumption of air in car salon the built-in fan of fresh air can work at several steps.

If fresh air outside does not be sucked in, for example, at poor quality of air, the system can be switched to a circulation mode. In this mode in salon only internal air circulates. If it proceeds rather long time, glasses in salon mist over.

The conditioner consists of a heater and the refrigerator. The conditioner refrigerator - from the compressor, the condenser, a throttle, the evaporator, capacity with a coolant and pipelines. In system the coolant (R134á type) which, depending on temperature and pressure, can be in a liquid or gaseous state circulates.

The compressor of the conditioner is given in rotation from a cranked shaft of the engine by means of a ridge belt. He creates pressure to 30 atm. in a contour of cooling of installation owing to what the coolant representing gas, heats up. In the condenser the coolant is cooled with external air (not arriving in salon).При it the warmed-up coolant is condensed, turning into liquid. Having big pressure, it is passed through a throttle therefore its pressure falls. After that the coolant evaporates, at the same time strongly being cooled. In the evaporator the coolant selects heat from air blown through it. Air is cooled. The cooled air arrives in car salon. As a result of heating in the evaporator the coolant turns into gas and under low pressure arrives in the compressor then process of circulation repeats.

If at work works with electric equipment are in addition carried out, it is necessary to disconnect surely a negative cable (-) the storage battery. For this purpose surely observe indications of the Section Replacement of the storage battery.

On models with the diesel engine the additional heating element which is coming into effect at low external temperature is established. The heating element is directly behind the heat exchanger. After engine start, depending on external temperature, it within several seconds heats up cold air arriving in the car.

If in a heater or climatic installation there is a malfunction, it is fixed in memory of malfunctions. Information from memory can be the device for reading of malfunctions считана.

To order the car can be equipped with the automatic, electronic operated conditioner at which air temperature of the driver and forward passenger are regulated separately. In addition, through the connecting hose going from the conditioner to a ware box, the refrigerating box if it is available in a ware box can be cooled.

The mode of automatic work provides automatic maintenance of temperature in salon and deletes moisture from air. Besides, air temperature, its quantity and distribution are automatically regulated and fluctuations of external temperature are compensated. In an economic operating mode the conditioner is switched off, but the heater and system of ventilation continue to work. The compressor of the conditioner does not work with a way of shutdown of the conditioner, therefore fuel is saved. At diesel engines additional heating, besides, is switched off. It also brings economy of fuel.

Security measures at service of the air conditioner

Central air should be served by exclusively prepared technicians trained in safe working methods with use of the appropriate equipment with observance of rules of depressurization, acquainted with receptions of collecting and order of storage of an automobile coolant.

    Do not allow contact of a coolant to skin. At work near central air put on goggles. At coolant hit on skin or eyes do not pound the struck place. Immediately wash out cold water within not less than 15 minutes. Immediately address to the doctor or in medical institution. Self-treatment is not allowed. The coolant is stored in a new cylinder under pressure. Store a cylinder at temperature not above 50°С. Take the measures excluding falling of a cylinder from height or other situations which can lead to its damage. Works should be carried out in well aired room. The coolant quickly evaporates, has no smell. Its accumulation leads to reduction of access of oxygen and difficulty of breath. The gaseous coolant is heavier some air and rather quickly should gather below, for example, under the car. At combustion of a coolant poisonous gas is formed. Store a coolant far from open sources of fire. Do not smoke. When using an ardent techeiskatel avoid smoke inhalation. At carrying out welding works near central air to influence of high temperature or an open flame. The overheat can lead to pressure increase in system and to ignition. Condenser or evaporator cleaning by means of water vapor is not allowed. It is necessary to use only cold water or the compressed air.