Audi A4

Since 1994 of release

Repair and car operation



Audi А4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ Exhaust system
- Cooling system
   So there is a cooling
   Check of level of a cooling liquid
   Antifreeze check
   Check of system of cooling on tightness
   Radiator
   Zapornaja cover of system of cooling
   The thermostat
   The help at malfunctions
   The water pump
   Klinovoj belt of the water pump
   Various models of fans
   The vjazkostnyj fan
   The fan of a radiator with the electric drive
   Infringements in work of the fan of a radiator
   The help at malfunctions
+ Fuel tank and the fuel pump
+ The air filter and channels всасывания
+ Injection system
+ Coupling
+ Transmission and the main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tyres
+ The electrotechnical equipment
+ Ignition system
+ Illumination
+ The alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics



The fan of a radiator with the electric drive

In Audi A4 the fan with the electric drive is put only in the presence of the strengthened cooling (an automatic transmission, the towing device in a factory complete set, climatic installation), it joins only in case of need.

Therefore the temperaturno-dependent switch is built in a radiator. If he "feels" that a cooling liquid proceeding by it after radiator passage still too hot includes the fan by means of the relay in a nest 2 in «восьмиштырьковой to a relay support». It also switches off the fan electric drive when the temperature below in a radiator falls to certain size.

The two-level fan of a radiator with an electro-drive

In some versions Audi A4 there is a two-level fan of a radiator with the electric drive which thanks to presence of two steps of inclusion can react to rise in temperature of a cooling liquid more individually. It is possible thanks to a two-level thermoswitch which includes the second way of a current to the fan through other relay in a nest 3 in «восьмиштырьковой to a relay support» and additional resistance.

Temperatures of switching of a thermoswitch of a radiator

Fan model
Inclusion temperature
Deenergizing temperature
The one-stage
92–97 °С
Nearby 84 °С
The two-level
  • 1st step
92–97 °С
84 °С
  • 2nd step
99–105 °С
91 °С

 Council: Because of electric connection through the plug 30 fan can suddenly join even at the idle engine. Be cautious at carrying out to work in an impellent compartment!


The thermoswitch (arrow) of the fan of a radiator with the electric drive in cars with the strengthened cooling is screwed below at the left on a radiator.