Repair and service Audi A8 in body D2 with 1994 for 1999 of release.
1. Car operation
2. Maintenance service
3. Petrol engines of 2,8 l
4. Petrol engines of 3,7 and 4,2 l
5. Diesel engines of 2,5 l
6. Diesel engines of 3,3 l
7. Systems of ignition and injection of fuel of petrol engines
8. System of release of the fulfilled gases of cars with petrol engines
9. The power supply system of diesel engines
10. System of prestarting heating of diesel engines
11. System of release of the fulfilled gases of cars with diesel engines
12. Greasing system
13. Cooling system
14. Coupling
15. A transmission
16. Shaft of a drive of forward wheels
17. Features of a design of transmission of all-wheel drive cars
18. A suspension bracket
19. Wheels and tyres
20. A steering
21. Brake system
22. A body
23. Heating and air-conditioning system
23.1. The general data
23.2. An air inlet with a folding shutter
23.3. The fan
23.4. The fan resistor
23.5. The pollen filter
23.6. The central ventilating lattices
23.7. A lateral ventilating lattice
23.8. The top lateral ventilating lattice
23.9. A lateral nozzle of defrosting
23.10. The block of management E87 a central air
23.11. An arm of the compressor of the conditioner
24. An electric equipment
25. Electric schemes
 



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23.1. The general data

Air submitted system of ventilation in salon of the car, can be warmed up or be cooled depending on the conditions of comfort chosen by the driver and passengers. Heating and air-conditioning systems separate, however their units and knots settle down in car salon in the general case under the panel of devices. All stream of air submitted to salon goes for heating or cooling through the same casing. The temperature and speed of a stream of air is regulated by means of the same controls.
Heat allocated at work of the engine, is transferred by a cooling liquid to the radiator of a heater located in salon. The brought stream of air from ventilation system passes through a radiator and heats up heat of the cooling liquid proceeding in a radiator.
The central air deletes excessive warmly and a moisture from salon. The coolant circulating in the form of a liquid in that part of system where the high pressure is supported, evaporates and turns to gas on a site of low pressure. At gas expansion there is a cooling accompanied by selection of heat from air, submitted the fan in passenger salon, and fall of its temperature. Further in process of passage through the condenser the coolant gives absorbed heat to air. The cycle of selection of heat proceeds infinitely long in process of coolant circulation on the closed contour. From air submitted to salon, the moisture owing to condensation on the evaporator of the refrigerating chamber leaves.

The prevention
Air central air represents potential danger. At its service observance of certain rules is required. For performance of the majority of operations on repair and central air service the special equipment and certain skills of work is required.

Body ventilation is provided by formation of a through stream of air. Fresh air gets in the car through an air inlet located before a windscreen. The stream of air from salon comes to light through the final channels located on each side of a body.
Speed of a stream of air is regulated by the fan.
The system of heating of air of the mixed type is intended for fast reaction to change of temperature of air in salon and reduction of fluctuations of temperature of the warmed-up air.
For hit prevention in salon of the car of fresh air the mode рециркуляции air is provided.

Safety measures at service of a central air of air
The central air refuels a coolant «Freon R12», system details are under working pressure from above 300 атм. A source of the raised danger at system service by unprepared technicians and at use of the equipment which has been not intended for this purpose, is the high pressure and chemical influence of a coolant.
The automobile coolant «Freon R12» is dangerous to environment. For protection of environment firm Volkswagen recommends to use at depressurization of a central air the equipment on recycling and the processing, supplied with the certificate of insurance laboratory (UL).

Preventions
The central air should be served by the technicians trained in safe working methods with application of the appropriate equipment and observance of rules of depressurization, an order of gathering and storage of an automobile coolant.
Do not suppose contact of a coolant to a skin.
At work near to a central air put on goggles.
At coolant hit on a skin or in eyes do not pound the amazed place, immediately wash out cold water not less than 15 minutes and address to the doctor. Self-treatment is not supposed.
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 spent in well aired premise. The coolant quickly evaporates, interferes with access of oxygen and complicates breath.
The gaseous coolant is heavier than air and rather quickly should gather below, for example under the car.
At coolant combustion poisonous gas is formed. Store a coolant far from open sources of fire. Do not smoke. At using ardent течеискателем avoid smoke inhalation.
At carrying out of welding works near to air central air always delete from it a coolant. Electric welding near to pipelines with a coolant can cause decomposition of a coolant under the influence of ultra-violet radiation.
Do not subject a detail of a central air to influence of a heat or an open flame. The overheat can lead to pressure increase in system and to ignition.
Clearing of the condenser or the evaporator by means of water steam is not supposed, it is necessary to use only cold water or compressed air.

Fig. 17–1 (and,). Elements of system of heating and air-conditioning: 1 – the temperature gauge; 2 – the pressure gauge; 3 – a pulley of the compressor of the conditioner; 4 – the gauge of the compressor of the conditioner; 5 – the conditioner compressor; 6 – the tank; 7 – the switch of low pressure of the conditioner; 8 – channels of removal of air from car salon; 9 – the pollen filter; 10 – клапанный the block; 11 – the gauge of temperature of an air inlet; 12 – the engine of management of a folding shutter; 13 – the evaporator; 14 – a folding shutter рециркуляции air; 15 – the engine of management of a folding shutter рециркуляции air; 16 – the fan; 17 – the block of management of the fan; 18 – the condenser; 19 – a stopper; 20 – the gauge of quality of air; 21 – the gauge of temperature of an air inlet


Notes
Before removal of the gauge 1 (fig. 17–1) it is necessary to remove a bumper.
Disconnect an electric socket from the gauge and release from fastening in an air line.
If conditioner Denso compressor is established, the gauge of the compressor of the conditioner is absent.
If the gauge of pressure of the conditioner is established, the switch of low pressure of the conditioner is absent.

The prevention
For normal work of system of ventilation of salon of the car do not close air lines – do not load a luggage carrier to the top shelf.


23. Heating and air-conditioning system

23.2. An air inlet with a folding shutter