Audi 100

1982-1990 of release

Repair and car operation

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 thermostat check
   4.3. Removal and installation of the water pump
   4.4. Check and replacement of the sensor of turning on of the electrofan
   4.5. Replacement of the sensor of temperature of cooling liquid
   4.6. Removal and installation of a radiator of system of cooling
+ 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


System of cooling of the four-cylinder engine

1–heat exchanger of cooling of oil of automatic transmission;
3–a hose bringing a radiator;
4–sealing ring of a cover
5–thermostat cover;
7–case of the water pump;
9–cover of the water pump;
10-roller of the water pump;
11-pulley of the water pump;
12-fan casing;
13-radiator casing;
15-rubber plug;
16-sensor of turning on of the fan;
17-sealing ring of the sensor;
19-a hose taking away a radiator;
21-top rubber plug;

22-top casing of a radiator;
23-Parootvodyashchy hose;
broad tank;
25-broad tank;
26-a hose from a tank to a radiator;
27-sealing ring of the water pump;
28-thermoswitch of an automatic zaslonka;
29-branch pipe of a shirt of cooling;
30-the sensor of temperature of cooling liquid;
31-sensor of turning on of the fan;
33-a branch pipe of selection of liquid in a heater;
34-a tube liquid plum from a heater;
35-a hose taking away the heat exchanger;
36-a hose bringing the heat exchanger

System of cooling of the five-cylinder engine

1–fan casing;
3–broad tank;
4–tank stopper;
6–a hose from a tank to a radiator;
8–bottom casing of a radiator;
9–top casing of a radiator;
10-Parootvodyashchy hose;
11-water pump;
12-sealing ring;
13-a hose taking away a radiator;
14-branch pipe;
16-thermostat cover;
18-sealing ring of the thermostat;
19-sensor of turning on of the electrofan;
20-a hose bringing the thermostat;
21-a tube of a supply of liquid to a heater;
22-a hose bringing a heater;
23-a hose taking away a heater

The cooling system completely tight, consists of a radiator, the water pump, the thermostat, the broad tank, hoses connecting them and the electrofan. 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. While the engine cold, the thermostat is closed and liquid circulates on a small circle, passing a radiator. When the temperature of liquid reaches about 87 ° With, the thermostat starts to open, and liquid. to circulate on a big circle through a radiator. The electrofan copes the sensor of switching off of the fan, located in the lower part of a radiator. The fan turns on at temperature of cooling liquid 93-98 ° With, and is switched off at 88–93 ° by Page.

Capacity of system of cooling (with a heater) makes:

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

To change cooling liquid it is recommended approximately in 2 years, and also at replacement of a radiator, the engine, a head of the block of cylinders, etc.