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

4.2. Replacement and thermostat check


If the engine overheats, and the radiator thus remains cold, it indicates malfunction of the thermostat. If the faulty thermostat is constantly open, the engine will not get warm to working temperature. In these cases the thermostat replace.

1. To merge cooling liquid (see subitem 1–3 subsections 4.1).
2. To unscrew bolts and to uncover (5) (see fig. System of cooling of the four-cylinder engine) or (16) (see fig. System of cooling of the five-cylinder engine) thermostat.
3. To take out from a cover a sealing ring.
4. To take out the thermostat from a nest.
5. To measure a distance. Then to heat up the thermostat in water. The beginning of opening of the thermostat about 87 ° With, the opening end – about 102 ° S.Posle of heating to measure A distance. The serviceable thermostat a difference of distances of A and a should have at least 8 mm.
6. To replace a sealing ring of a cover of the thermostat (see fig. System of cooling of the four-cylinder engine, fig. System of cooling of the five-cylinder engine).
7. To establish the thermostat in a nest so that the arrow on a cross-piece of the thermostat was directed down.
8. To establish a cover, to twirl bolts and evenly to tighten the moment of 10 N · m (1,0 kgfs · м).
9. To fill in liquid in cooling system.