Audi A3

Since 1997 of release

Repair and car operation

Audi A3
+ The maintenance instruction
+ Current leaving and service
+ The engine
- Systems of cooling, heating
   - System of cooling of the engine
      Antifreeze – a protection frame from freezing
      Replacement of a cooling liquid
      Removal, installation and thermostat check
      Removal and radiator and fan installation
      Removal and installation of the pump of a cooling liquid
      Check of system of cooling under pressure
      Check of a thermoswitch of the fan of cooling
   + Systems of ventilation, heating and air conditioning
+ The power supply system and release of the fulfilled gases
+ Engine electric equipment
+ Manual box of a gear change
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Electroschemes

Check of system of cooling under pressure


Tightness of system and safety valve work in a radiator cover can be checked up by means of the pump 4800–1.

1. Warm up the engine so that the index showed normal working temperature of a cooling liquid.


At the hot engine before opening of a broad tank put on it a thick rag to exclude emission of a hot liquid and steams that can lead to a burn. The cover can be opened only at liquid temperature more low +90°С.

2. Establish on a branch pipe on a broad tank the device for pressure check, for example, HAZET 4800–1 with an adapter 4800–5.
3. Create the manual pump of the device superfluous pressure nearby 1.0 bar and support it. If pressure falls, check up visually system on tightness and eliminate leaks.
4. For safety valve check establish on a cover of a broad tank device HAZET 4800–1 with an adapter 4800–5. Create the manual pump superfluous pressure. At pressure 1.4 – 1.6 bar the safety valve should work.

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