Volkswagen Polo 3 with 1994 for 2001 of release.
1. The general data
2. The engine
3. Greasing system
4. Cooling system
4.1. A cooling liquid
4.2. A radiator and вентилято
4.2.1. The control of a cover of a broad tank and a radiator
4.2.2. Dismantle and radiator installation
4.2.3. Fan check
4.2.4. Check of the gauge of an overheat
4.3. The water pump
4.4. The thermostat
5. Systems of injection of fuel
6. Ignition system
7. Coupling
8. A mechanical transmission
9. A drive of wheels
10. A steering without the amplifier
11. A steering with the hydraulic amplifier
12. A forward suspension bracket
13. A back suspension bracket
14. Brake system
15. An electric equipment
16. Heating and ventilation system
17. An automatic transmission
18. Appendices

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4.2.1. The control of a cover of a broad tank and a radiator

The cooling system works under superfluous pressure. The cover of a broad tank has a spring, the valve which opens at superfluous pressure 1,3–1,5 атм. At an elevated pressure the temperature of boiling of a liquid exceeds 100 With.
For the cover control it is necessary to have special опрессовочный the pump. It is screwed on a cover (fig. 99) and put in action before valve opening. It should occur before achievement of the specified pressure. If it not so it is necessary to replace a tank cover.

Fig. 99. Опрессовка covers of a broad tank

Using the same опрессовочный the pump, it is possible same way to check up all system of cooling on presence of leakings. For this purpose the pump is connected to a broad tank. Superfluous pressure lead up to 1,0 атм and check on a manometre that pressure keeps not less than 2 minutes If it does not occur, cooling system негерметична.

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4.2. A radiator and вентилято
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4.2.2. Dismantle and radiator installation