Audi A3

since 1997 of release

Repair and car operation

Audi A3
+ Maintenance instruction
+ Current leaving and service
+ Engine
- Systems of cooling, heating
   - System of cooling of the engine
      Antifreeze – means of protection from freezing
      Replacement of cooling liquid
      Removal, installation and thermostat check
      Removal and radiator and fan installation
      Removal and installation of the pump of 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 production of the fulfilled gases
+ engine Electric equipment
+ Manual box of gear shifting
+ Automatic transmission and models with a full drive
+ Coupling and power shafts
+ Brake system
+ Suspension bracket and steering
+ Body
+ Onboard electric equipment
+ Elektroskhema


Check of system of cooling under pressure


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

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


At the hot engine before opening of a broad tank put on it a thick rag to exclude emission of hot liquid and паров that can lead to a burn. The cover can be opened only at liquid temperature below +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 about 1.0 bar and support it. If pressure falls, check visually system on tightness and eliminate leaks.
4. For check of a safety valve establish on a cover of a broad tank the HAZET 4800-1 device with an adapter 4800–5. Create the manual pump superfluous pressure. At pressure 1.4 – 1.6 bar the safety valve should work.