Audi 100

1982-1990 of release

Repair and operation of the car




Audi 100
+ 1.1. Governing bodies and devices
+ 2. Technical characteristics
+ 3. Engines
- 4. Cooling system
   4.1. Replacement of cooling liquid
   4.2. Replacement and check of the thermostat
   4.3. Removal and installation of the water pump
   4.4. Check and replacement of the sensor of turning on of the electric fan
   4.5. Replacement of the sensor of temperature of cooling liquid
   4.6. Removal and installation of a radiator of the cooling system
+ 5. Exhaust system
+ 6. Power supply system
+ 7. Transmission
+ 8. Running gear
+ 9. Steering
+ 10. Brake system
+ 11. Body
+ 12. Electric equipment


.

4. Cooling system

GENERAL INFORMATION

Cooling system of the four-cylinder engine


1 – heat exchanger of cooling of oil of automatic transmission;
2 – collar;
3 – the hose bringing a radiator;
4 – sealing ring of a cover
thermostat;
5 – thermostat cover;
6 – thermostat;
7 – case of the water pump;
8 – laying;
9 – cover of the water pump;
10 – roller of the water pump;
11 – pulley of the water pump;
12 – fan casing;
13 – radiator casing;
14 – arm;
15 – rubber plug;
16 – sensor of turning on of the fan;
17 – sealing ring of the sensor;
18 – electric fan;
19 – the hose which is taking away a radiator;
20 – radiator;
21 – top rubber plug;

22 – top casing of a radiator;
23 – steam discharge hose;
24 – stopper
broad tank;
25 – broad tank;
26 – a hose from a tank to a radiator;
27 – sealing ring of the water pump;
28 – thermoswitch of the automatic gate;
29 – cooling shirt branch pipe;
30 – sensor of temperature of cooling liquid;
31 – sensor of turning on of the fan;
32 – laying;
33 – a branch pipe of selection of liquid in a heater;
34 – a tube liquid plum from a heater;
35 – the hose which is taking away the heat exchanger;
36 – the hose bringing the heat exchanger


Cooling system of the five-cylinder engine

1 – fan casing;
2 – electric fan;
3 – broad tank;
4 – tank stopper;
5 – collar;
6 – a hose from a tank to a radiator;
7 – radiator;
8 – lower casing of a radiator;
9 – top casing of a radiator;
10 – steam discharge hose;
11 – water pump;
12 – sealing ring;
13 – the hose which is taking away a radiator;
14 – branch pipe;
15 – laying;
16 – thermostat cover;
17 – thermostat;
18 – sealing ring of the thermostat;
19 – sensor of turning on of the electric fan;
20 – the hose bringing the thermostat;
21 – a liquid supply tube to a heater;
22 – the hose bringing a heater;
23 – the hose which is taking away a heater

The cooling system completely tight, consists of a radiator, the water pump, the thermostat, a broad tank connecting them hoses and the electric fan. The radiator is established in front of the engine on cars with four-cylinder engines or sideways. with the five-cylinder. The system works as follows. Until the engine cold, the thermostat is closed and liquid circulates on a small circle, passing a radiator. When temperature of liquid reaches about 87 °C, the thermostat starts opening, and liquid. to circulate on a big circle through a radiator. The electric fan copes the sensor of switching off of the fan located in the lower part of a radiator. The fan turns on at a temperature of cooling liquid of 93-98 °C, and is switched off at 88–93 °C.

Cooling system capacity (with a heater) makes:

Four-cylinder engines
7,0 l
Five-cylinder petrol engines, except MS
8,1 l
MS engines
8,5 l
Diesels without pressurization
8,0 l
Diesels with pressurization
9,4 l

It is recommended to change cooling liquid approximately in 2 years, and also when replacing a radiator, the engine, a head of the block of cylinders, etc.