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 a thermoswitch of the fan of cooling


The thermoswitch should be checked up, if at the hot engine the fan does not join. A check condition: the thermostat, a radiator and a cover are serviceable.

The electrofan thermoswitch is located at the left on half of height of a radiator.

The thermoswitch has two steps of inclusion. At the raised temperature it includes the fan on higher step of speed.

1. Check up a safety lock № 3 electrofans in a box of safety locks/holders of the storage battery, if necessary replace.
Colours of cables of a thermoswitch

Step 1 It red / the white
Step 2 It red / the black
+ The red
2. Check up, whether the radiator in the field of a thermoswitch heats up in general.
3. Расстыкуйте a thermoswitch socket. At the wire tip connect at first the plug + (plus) to the plug 1 (it red / a white cable). The fan should rotate on slow speed. Then connect the plug + to the plug 2 (it red / a black cable). The fan should rotate with higher speed. If the fan rotates in both cases, replace a thermoswitch.
4. If the fan does not rotate, or if it rotates only on one speed, check up electric wires by means of the electroscheme. Check up contacts of connections and reliability of fastening.
5. The moment of an inhaling of fastening of the fan: 35 Н m.
6. Check up work of a new thermoswitch. Start the engine and allow to it to work on single turns until the cooling fan will join.

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