Audi A4, S4
since 2000 release
Repair and operation of the car
Audi A4, S4
+ Governing bodies and methods of safe operation
+ Current leaving and service
- Cooling systems, 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 the drive of the ventilating gate
Removal and installation of the control unit of the heater/conditioner
Removal and installation of the electric motor of the 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
+ 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
The heater case with the heat exchanger and the additional heater
Elements of the air conditioning system of salon
Removal of the evaporator of the conditioner of air
Address also to the Section Heater, ventilation and the conditioner of air.
Works with central air have to be performed by experts.
Fresh air for system of heating and ventilation is sucked in by the electric fan. 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 the air coming to salon. During wet weather, the 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 fogging of glasses is eliminated.
Then air is distributed on ventilating nozzles in salon of the car.
Through a heater radiator constantly there passes hot cooling liquid of the cooling system of the engine. For regulation of a consumption of air in salon of the car 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 the 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 coolant and pipelines. In system coolant (R134a type) which, depending on temperature and pressure, can be in a liquid or gaseous state circulates.
The compressor of the conditioner is given to rotation from a cranked shaft of the engine by means of a ridge belt. He creates pressure to 30 atm. in an installation cooling contour owing to what the coolant representing gas heats up. In the condenser coolant is cooled with the external air (which is not coming to salon). Thus the warmed coolant is condensed, turning into liquid. Having big pressure, it is passed through a throttle therefore its pressure falls. After that coolant evaporates, at the same time strongly being cooled. In the evaporator coolant selects heat from the air blown through it. Air is cooled. The cooled air comes to salon of the car. As a result of heating in the evaporator coolant turns into gas and under low pressure comes to the compressor then process of circulation repeats.
On models with the diesel engine the additional heating element which is coming into effect at a low external temperature is established. The heating element is directly behind the heat exchanger. After start of the engine, depending on external temperature, it within several seconds heats the cold air coming to the car.
If in a heater or climatic installation there is a malfunction, it is fixed in memory of malfunctions. The schitana information from memory can be the device for reading of malfunctions.
To order the car can be equipped with the automatic, electronically controlled 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, the air temperature, its quantity and distribution are automatically regulated and fluctuations of external temperature are compensated. In economy mode of work the conditioner is switched off, but the heater and system of ventilation continue to work. By shutdown of the conditioner the compressor of the conditioner does not work therefore fuel is saved. At diesel engines, besides, additional heating is switched off. It also brings economy of fuel.
Security measures at service of the air conditioner
Central air has to 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 methods of collecting and order of storage of automobile coolant.