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 a thermoswitch of the fan of cooling


The thermoswitch should be checked, if at the hot engine the fan does not turn on. Check condition: the thermostat, a radiator and a cover are serviceable.

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

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

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

Step 1 it is red / the white
Step 2 it is red / the black
+ the red
2. Check, whether the radiator in the field of a thermoswitch heats up in general.
3. Rasstykuyte I will corrode a thermoswitch. At the tip of a wire connect at first the plug + (plus) to the plug 1 (it is red / a white cable). The fan should rotate on slow speed. Then connect the plug + to the plug 2 (it is 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 electric wires by means of the electroscheme. Check contacts of connections and reliability of fastening.
5. Moment of an inhaling of fastening of the fan: 35 N of m.
6. Check work of a new thermoswitch. Start the engine and let's to it work on single turns until the cooling fan will turn on.