Audi A4

since 1994 release

Repair and operation of the car

A4 Audi
+ 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


The radiator represents the tank from synthetic material which is supplied with edges from the right and left side. From this collector cooling liquid flows on radiator tubes from light metal which for increase in the surface (and, therefore, the cooling surface) are supplied with the cooling edges. Through the cooling edges cooling liquid can give warmth to environment.

If leakage of a radiator is suspected, it is necessary to carry out in a workshop the described test by pressure. At obvious defect you can also dismantle at once a radiator and send it to repair. There are special workshops on repair of radiators (the industry telephone reference book) which carry out such repair or offer radiators on replacement.

Dismantle of a radiator

For dismantle of a radiator it is necessary to deblock by means of a screw-driver both fixing screws (1) on forward part of the car and to take out them from the fixing openings (2).

We do not advise you to be engaged demontazhy a radiator in the car with an automatic transmission. Thus it is necessary to disconnect tubes of the oil heater from ATF integrated in a radiator that then involves problem filling of a transmission of ATF. Besides, dirt should not get to system of circulation of ATF. Further you will find the description of dismantle of a radiator for cars with a mechanical transmission.


  1. Dismantle a front bumper (the head Detali of a body).
  2. Merge cooling liquid in capacity.
  3. Disconnect hoses from a radiator; the thick hose below from the driver can be removed, having wrung out a metal bracket in connecting knot of a hose.
  4. Where it is necessary, dismantle an air duct on the right or left side of a radiator.
  5. Disconnect if is (the strengthened cooling, climatic installation), sockets of wires on the radiator fan thermostat switch, and also sockets on the radiator fan.
  6. Deblock by means of a small screw-driver a fixing bolt of a radiator above on forward part of the car and remove it.
  7. Take out an intermediate rubber support forward.
  8. Pull a radiator for the upper edge forward and remove from the lower fixing pins up.

Cleaning of a radiator

Till the summer period of an edge of a radiator have to be cleared of the corpses of insects which stuck to it, differently the cooling effect worsens.


  1. Sprinkle the dried remains of insects the means dissolving protein.
  2. After a while wash away means from a reverse side of a radiator. Start up not too strong stream through radiator plates. The rigid brush or the sharp tool can damage radiator plates.
  3. Insert a water hose into an opening round the radiator fan. Where is, in addition lift the air gate on a reverse side of a radiator and water through the openings located behind it.

Dismantle of hoses of supply of cooling liquid

At the left: in the car with the six-cylinder engine there is an additional carving stopper (arrow) plum of cooling liquid which is below at the engine near a dividing seam with a case.

On the right: the carving stopper of a drain opening (2) ahead on the right at a radiator is unfortunately available only at the dismantled bumper. Sometimes in cars with the electric fan of a radiator (the strengthened cooling) the thermoswitch (1) cooling liquid is built in.

At the left: to remove air from the cooling system, it is necessary to shift after weakening of a collar a hose (3) heatings on a connecting tube (1) so that the air vent was bared (2). It is possible when the opening in a tube coincides with an opening in a hose.

On the right: at the six-cylinder engine for removal of air from the cooling system it is necessary to open in addition a bolt with an internal hexagon (shooter) at the left below on a tube of cooling liquid.


  1. Get original hoses of the necessary curved form and new collars as spare parts.
  2. Merge and collect cooling liquid.
  3. Weaken screw collars a screw-driver.
  4. Squeeze spring collars of hoses nippers for "ears" against the stop.
  5. In some models the thick hose at the left below on a radiator is recorded by a metal bracket in connecting knot of a hose.
  6. Wring out a metal bracket.
  7. Remove hoses.
  8. Weaken strongly sitting ends of hoses a screw-driver, having inserted it between a hose and a branch pipe and then having carefully wrung out.
  9. Pull quite far new hoses over branch pipes so that they could not slide off again.
  10. Do not tighten screw collars with a force, differently a thread will be stripped.
  11. The hose recorded by a metal bracket: check a sealing ring, pull connecting knot of a hose before entry into a groove of a metal bracket.

 Council: The water hose which is broken off or bitten through by rodents can seldom be replaced at once as often necessary water hose is not present in the storeroom. The gluing tape for repair of the cooling system can temporarily help. It is well pasted on the cleared and dry rubber hoses. At big leak can help if to open a radiator cover on one turn in order that in the cooling system pressure which the bandage will not be able to resist went down. Only now carefully go to a workshop. Do not lose sight of the sensor of temperature and level of cooling liquid!

Plums of the cooling means


  1. Let's cool down to the engine, at the hot engine there is a danger of a burn!
  2. Open a locking cover of a broad tank.
  3. Dismantle the lower facing of a motive compartment (the head Detali of a body).
  4. Substitute under the engine a wide tray for reception of cooling liquid.
  5. Remove the lower water hose on a radiator. In addition:
  • Four-cylinder engine: in the direction of travel at the left on the engine remove a thick hose to a radiator and thinner hose to the heating heat exchanger, and also on the case of the thermostat and merge liquid.
  • Six-cylinder engine: merge cooling liquid, having unscrewed below on the engine block a carving stopper of a drain opening.

 Council: Antifreeze is poisonous therefore it cannot be merged simply in the sewerage. Instead pour out it in a separate vessel and send to special waste (find out where there is point of reception in local administration).

Filling of the cooling system with new cooling liquid

Gulf of new cooling liquid: delay a heating hose on the connected tube so that the air vent became visible (1). Then put on a jellied branch pipe of a broad tank a piece of a hose 10 cm long (2) to increase height of its filling.

As in the engine there is a certain amount of cooling liquid, maybe, everything is not required that amount of liquid specified in the table at the beginning of the head.


  1. Before filling open a collar of a water hose to heating and shift it back so that the air vent was bared.
  2. Six-cylinder engine: open the air screw in a tube of cooling liquid under a broad tank.
  3. Put on a branch pipe of a jellied opening a piece of a hose 10 cm long (diameter about 42 mm) to increase gulf height.
  4. In the beginning fill in antifreeze, then, whenever possible, distilled water so that the level of liquid reached the upper edge of a broad tank.
  5. Only for six-cylinder engine: fill in liquid until it does not act from the air screw. Close the screw (15 Nanometers).
  6. Fill in liquid further until it does not act from an air vent.
  7. Again shift a heat exchanger hose in initial situation (close an air vent) and tighten a collar.
  8. Then completely pour liquid.
  9. Screw up a locking cover on a broad tank.
  10. Start the engine, and let it work until the radiator does not become hot in the field of the lower connecting knot.
  11. If it is necessary, correct liquid level. It has to be between marks of "MIN" and "MAX" of a broad tank; when engine hot, naturally, above.
  12. Be careful, opening a locking cover at more hotly cooling liquid.