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


Check of the cooling system on tightness

To reveal untight sites in the cooling system the easiest when the engine hot and, respectively, in the cooling system dominates working pressure. Therefore for check of water hoses put on working gloves to avoid burns.


  1. Hoses at a radiator and the engine, and also in system of heating are tight?
  2. Cracks in hoses? Knead them to establish whether there were hoses rigid and fragile – in this case replace.
  3. Kneading hoses, it is possible to establish whether there were no untight sites caused by stings of rodents?
  4. The ends of hoses are leaky attached to branch pipes?
  5. Whether
  6. tension bolts of collars of hoses are well tightened?
  7. The rusted collars of hoses during the movement and at total working pressure in the cooling system can unexpectedly not sustain a pressure. Replace!
  8. In a workshop tightness of the cooling system is checked by the special manual air pump with the manometer.
  9. This device is installed on an opening of a broad tank and then pressure in 1 bar is pumped up.
  10. If the indication of a scale does not decrease within one-two minutes, then the cooling system is tight.