Audi A4

since 1994 release

Manual of the car

Audi A4
+ Running gear
+ Regular servicing
+ Engines
+ Turbo-supercharging
+ System of an exhaust
- Cooling system
   So there is a cooling
   Check of level of cooling liquid
   Antifreeze check
   Check of the cooling system on tightness
   Locking cover of the cooling system
   The help at malfunctions
   Water pump
   Maple belt of the water pump
   Various models of fans
   Viscous fan
   The radiator fan with the electric drive
   Violations in operation of the fan of a radiator
   The help at malfunctions
+ Fuel tank and fuel pump
+ Air filter and channels of absorption
+ System of injection
+ Coupling
+ Transmission and main transfer
+ Suspension bracket of wheels and steering
+ Brakes
+ Wheels and tires
+ Electrotechnical equipment
+ System of ignition
+ Lighting
+ Alarm equipment
+ Tools and devices
+ Heating and ventilation
+ Body details
+ Salon
Search of malfunctions
Technical characteristics


Antifreeze check

For check of frost resistance of cooling liquid you need the areometer. With its help the specific weight of liquid is measured. Due to different addition of anticorrosive means the specific weight of separate types of antifreeze can be a miscellaneous. For carrying out absolutely exact measurement you need the areometer which is adjusted on the filled-in antifreeze. In a doubtful case subtract the admission in 2–3 °C from the received size.


  1. Suck away a little cooling liquid from a broad tank, the areometer has to float freely.
  2. The areometer plunges more or less deeply depending on the specific weight of liquid.
  3. Determine by a scale up to what temperature protection against freezing works.
  4. In some devices there are arrows by which it is possible to determine frost resistance.

Regulation of concentration of antifreeze

Most often it becomes clear that concentration of antifreeze already insufficient. In this case it is necessary to add antifreeze; about about 1/2 l on 10 °C of increase of protection against freezing.


  1. Dismantle the lower facing of a motive compartment (the head Detali of a body).
  2. Substitute a tray under the car.
  3. At the cold engine disconnect the lower water hose from a radiator, merge from 1 to 2 l of cooling liquid.
  4. Again mount a hose and softly tighten the screw.
  5. Pour the corresponding amount of undiluted antifreeze and add together with the merged cooling liquid.