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
13.1. The general data
13.2. The thermostat
13.3. Replacement of a cooling liquid
13.4. The water pump of petrol engines of 2,8 l
13.5. Connecting pipes of system of cooling
13.6. The water pump of petrol engines of 3,7 and 4,2 l
13.7. The thermostat of petrol engines of 3,7 and 4,2 l
13.8. The water pump of diesel engines of 2,5 l
13.9. The thermostat of the diesel engine of 2,5 l
13.10. Forward section of a pipe of system of cooling of the diesel engine of 2,5 l
13.11. The left section of a pipe of system of cooling of the diesel engine of 2,5 l
13.12. The right section of a pipe of system of cooling of the diesel engine of 2,5 l
13.13. The central section of a pipe of system of cooling of the diesel engine of 2,5 l
13.14. The water pump of diesel engines of 3,3 l
13.15. The thermostat of diesel engines of 3,3 l
13.16. A forward average pipe of system of cooling of the diesel engine of 3,3 l
13.17. The left average pipe of system of cooling of the diesel engine of 3,3 l
13.18. A radiator
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
24. An electric equipment
25. Electric schemes
 



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13.1. The general data

The cooling system closed liquid, includes the water pump with a drive an auxiliary belt from a cranked shaft, the fan of a radiator with термовязкостной муфтой or an electric drive, a radiator, a broad tank, the thermostat, a heater radiator, hoses and switches. At start-up of the cold engine the cooling liquid does not arrive in a radiator as the thermostat valve is closed, and circulates on a shirt of the block and a head of the block of cylinders, then again arrives in the pump. Thus fast warming up of the cold engine is provided. When the cooling liquid will reach certain temperature, the thermostat valve opens also a hot cooling liquid passes through a hose to a radiator and is cooled by a stream of counter air. Термовязкостная муфта the radiator fan joins depending on air temperature behind a radiator. At achievement of certain temperature the valve in муфте opens and is put in action крыльчатка the fan.

Preventions
At opening of a cover of a broad tank on the hot engine it is necessary to be careful, as leaving steams can lead to strong burns. For this purpose close a cover of a broad tank a thick layer of a fabric and slowly unscrew a cover before occurrence of a hissing sound. After the hissing termination slowly unscrew and uncover a broad tank.
Do not suppose hit of a cooling liquid on clothes and a paint and varnish covering of a body. Otherwise wash out a surface a water considerable quantity.
All clips and collars which at dismantling of system of cooling will be damaged or cut, at assemblage it is necessary to replace with the new. For fastening of collars of tape type it is necessary to use special пассатижи VAG 1921. It is necessary to replace all removed linings and sealing rings with the new. At arrow assemblage on elements of system of cooling at their presence it is necessary to combine.
The merged cooling liquid is necessary for collecting and utilising.

Specifications
The thermostat

Temperature of the beginning of opening, С
87
Temperature of full opening, С
102
Thermostat valve stroke, mm
8

The inhaling moments, Н*м
The petrol engine of 2,8 l

Bolts of fastening of the case of the thermostat
10
Stopper plum of a cooling liquid from the block of cylinders of the engine
20
Bolts of fastening of the water pump
10
Bolt of fastening of a pulley of the water pump
25
Bolts of fastening of the case of the thermostat
10
Bolts of fastening of pipes of system of cooling to the block of cylinders
10
Bolts of fastening of the oil heat exchanger to a radiator
10
Nuts of fastening of a radiator to a forward cross-beam
20
The diesel engine of 2,5 l

Stopper plum of a cooling liquid from a drainage pipe
10
The water pump to the block of cylinders
10
Back casing of a gear belt in a head of the block of cylinders
10
Back casing of a gear belt to the fuel pump
10
Thermostat casing to the block of cylinders
10
Leading pulley of the fuel pump to a camshaft
22
Заглушка to the block of cylinders
10
Forward section of a pipe of a cooling liquid to the block of cylinders
22
Forward section of a pipe of a cooling liquid to a head of the block of cylinders
10
Back casing of a gear belt to a head of the block of cylinders
10
Back casing of a gear belt to the fuel pump
10
The diesel engine of 3,3 l

The water pump to the block of cylinders
10
Back casing of a gear belt to a head of the block of cylinders
10
Directing roller of a gear belt
70
The thermostat case
10
Average pipe of system of cooling to a head of the block of cylinders
10



13. Cooling system

13.2. The thermostat