Check of the thermostat of the cooling system operated on an algorithm. Audi A4 (from 2001 to 2005 release)
Service of Audi A4 from 2001 to 2005 release.
1. Operation and maintenance of the car
2. Engine
2.1. General information
2.2. Predvaritlny checks
2.3. Mekhanichsky part (petrol engines 2,0l)
2.4. Lubrication system
2.5. Cooling system
2.5.1. Removal and installation of the thermostat of the cooling system operated on an algorithm
2.5.2. Check of the thermostat of the cooling system operated on an algorithm
2.5.3. Removal and installation of the water pump
2.5.4. Pressure testing of the cooling system
2.6. System of injection
2.7. System of production of the fulfilled gases
2.8. Mechanical part (petrol engines 3,0; 3,2 l)
2.9. Mechanical part (petrol engines of 4,2 l)
2.10. Mechanical part (diesel engines of 2,0 l)
2.11. Tables
3. Transmission
4. Running gear
5. Steering mechanism
6. Brake system
7. Onboard electric equipment
8. Body
9. Schemes of electric equipment
 







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2.5.2. Check of the thermostat of the cooling system operated on an algorithm

Remove the thermostat of the cooling system operated on an algorithm.

Fig. 2.212. Big plate of the thermostat valve


Check the thermostat in a cold state. The big plate of the valve has to adjoin densely on all circle to a connecting flange (fig. 2.212).
If it not so, replace the cooling system thermostat.

Fig. 2.213. Check of a valve stroke of the thermostat


Connect contacts of the thermostat auxiliary wires from a set of supportive measuring applications to joint stock bank. Holding pincers, lower it to a flange vertically in a pan with the boiling cooling liquid (mixing proportions: 50% of G12+) (fig. 2.213).

ATTENTION
Do not touch metal parts of the thermostat as they heat up.

The resistive heater in addition heats wax in the thermostat.
Check whether the minimum course in 7 mm is reached 10 min. later.
If the minimum course in 7 mm is not reached, disconnect giving of tension from joint stock bank.

NOTE
This check cannot be made on air. In this case damage of the strain gage is not excluded.


2.5.1. Removal and installation of the thermostat of the cooling system operated on an algorithm

2.5.3. Removal and installation of the water pump