Audi 80/Avant (B4)

since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ Technical specification
+ Engines
+ System of production of the fulfilled gases
- Cooling system
   Check of level of cooling liquid
   Frost resistance check
   Check of system of cooling on tightness
   Carving cover of a broad tank
   List of malfunctions
   Water pump
   Maple belt of the water pump
   Fan of system of cooling
   Malfunctions of the fan of system of cooling
   List of malfunctions
+ Fuel tank and fuel pump
+ Air filter and airintaking channels
+ injection System
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Anti-blocking system of brakes
+ Wheels and tires
+ Body electrosystem
+ ignition System
+ Lighting
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ body Elements
+ Search of malfunctions
+ Specifications


The radiator is supplied with so-called tanks from plastic. They are located at models with 4-and the 6-cylinder engine on the right and at the left on a radiator, at 5-cylinder below and above. From these tanks cooling liquid directs through aluminum tubes of a radiator which for increase in their surface (and by that the cooling areas) are supplied with cooling edges. Through cooling edges cooling liquid gives heat to the atmosphere.

At suspicion on not tight radiator you should check in a workshop described by pressure. If defect is obvious, you can remove at once a radiator and bring it to repair.

Radiator removal

For removal of a radiator of the 4-cylinder engine turn off a 6-faced bolt (2) and disconnect fastening (1) radiator. The radiator of the 6-cylinder engine is established in the same way.


  1. To remove the bottom protection of a motor compartment (head body Elements).
  2. To merge cooling liquid.
  3. To remove from a radiator all hoses.
  4. To disconnect tips of wires on a thermoswitch of the fan of system of cooling.
  5. To remove tips of the fan of system of cooling.
  6. Models with 4-and 6-cylinder engines: to turn out fixing bolts/nuts above and below on both parties of a radiator.
  7. To press a radiator it is a little back and to take out together with the fan.
  8. Models with 5-cylinder engines: to remove the top protection of a radiator. For this purpose to unscrew nuts/bolts and to extend protection from forward fastenings.
  9. To remove tubes of system of cooling above and below on a radiator and also the small tube going to a broad tank on a radiator.
  10. Completely to unscrew a fixing partition on the right side of a radiator.
  11. To unscrew the bottom fastening of a radiator.
  12. To take out a radiator up.

The bolts specified here by shooters and nuts are necessary for turning on in order that it was possible to remove a protective casing of a radiator. Ahead the casing is in addition inserted into clips (arrows in the middle).

The arrow indicates a carving stopper of a ventilating opening in a branch pipe of system of cooling of the 5-cylinder engine. the 6-cylinder engine is also supplied with this stopper.

At the left: for plum of cooling liquid at model with the 4-cylinder engine tubes (1) and (2) on the thermostat case should be removed. In addition to open a carving stopper of a drain opening on a radiator.

On the right: the 6-cylinder engine is supplied with an additional carving stopper plum (arrow) which is below on the engine near a place of the socket of the case of a transmission.

Additional radiator

In certain options of equipment – for example, the conditioner, the traction coupling device, the strengthened cooling – the 5-cylinder engine is equipped with the additional water radiator standing directly ahead of the engine. This additional radiator is connected in parallel with the main radiator and increases thereby an active surface of cooling. Dismantle:


  1. To remove the bottom protection of a motor compartment (head body Elements).
  2. To merge cooling means.
  3. To disconnect from a radiator hoses of system of cooling.
  4. To turn out on an additional radiator fixing bolts/nuts above (one) and below (two).

Radiator cleaning

Before the beginning of a warm season and after it the surface of a radiator should be cleared of the remains which have pressed there of insects, cooling action otherwise worsens.


  1. To open a cowl, at the 5-cylinder engine in addition to remove a protective casing of a radiator from above.
  2. The dried-up remains of insects to sprinkle the means dissolving protein (for example Holts firm «Summer Screen»).
  3. Through certain time of action to sprinkle the same means a reverse side of a radiator. To wash out a radiator a weak stream of water. The rigid brush or the sharp tool can damage a radiator surface.
  4. To send a hose with water to openings round the fan of system of cooling. To raise rubber protective caps where are established, and to send a water stream to the openings located behind them.

Removal of hoses of system of cooling

As spare parts find original hoses of the necessary bent form and surely new collars.


  1. To merge cooling means.
  2. Turning-off collars to weaken by means of a screw-driver.
  3. Spring collars to compress on both "ears" by means of nippers against the stop.
  4. To remove hoses.
  5. Densely sitting ends of hoses to weaken by means of a screw-driver which needs to be pushed between a hose and a branch pipe and carefully to operate with it as the lever.
  6. New hoses to put on branch pipes dostochno it is deep, that they could not slide off.
  7. To tighten twisting collars, without applying special efforts, differently it is possible to strip a thread.

 Help: it is seldom possible to replace the torn or bitten-through hose at once. For example, often happens so that the necessary hose is not present in a warehouse. It is temporarily possible to help trouble, applying «Pannenband» of Weyer or "Hoseweld Bandage" firm of Holts firm. Both tapes are well pasted to the cleared and dry rubber hoses. At big leak sometimes happens it is useful to open a cover of a broad tank on one turn that in system of cooling pressure to which the bandage cannot resist could not be formed. Now it is possible to go very carefully to a workshop, constantly watching indications of sensors of temperature and level of cooling liquid.

Plums of cooling liquid


  1. Let's to the engine cool down, danger ожега otherwise is great!
  2. To open a carving cover of a broad tank.
  3. To remove the bottom protection of a motor compartment (head body Elements).
  4. To substitute under the engine wide capacity for plum of cooling liquid.
  5. To open a stopper of a drain opening below on a radiator or to remove the bottom hose of a radiator.
    In addition:
  6. Models with the 4-cylinder engine: in the movement direction at the left at the engine to remove and let out all liquid from a thick hose to a radiator and thinner to the heat exchanger of system of heating respectively on the thermostat case.
  7. Models with the 5-cylinder engine: behind on the block of cylinders to remove a hose with the cooling liquid, conducting to a heater.
  8. Further to remove a hose at the bottom pipeline with cooling means.
  9. Models with the 6-cylinder engine: to let out cooling liquid through a drain opening below on the block of cylinders.

 Help: antifreeze is poisonous, therefore it cannot be lowered simply in the sewerage. Instead it is necessary to bring together him in special capacity and to hand over as special garbage.

Filling of system of cooling

As in the engine always there is a quantity of cooling liquid, probably, it will not be possible to fill in all amount of liquid called in the table at the beginning of head.


  1. Before filling to open a carving stopper of a ventilating opening in a heater hose.
  2. Only the 6-cylinder engine: to turn out ahead at the engine a carving stopper on the pipeline with cooling liquid.
  3. At first to fill in antifreeze, then whenever possible distilled water while level will not rise to the upper edge of a broad tank.
  4. To pour liquid until she will not act from a stopper. Then to add completely.
  5. Only the 4-cylinder engine: the top water hose to a radiator slightly to raise, while cooling liquid will be filled in.
  6. To wrap a carving cover of a broad tank.
  7. To get the engine and to leave it to work until the electric fan of system of cooling will turn on.
  8. To switch off the engine and to add cooling liquid. Level of liquid should be between marks of "min" and «max» of a broad tank; at the engine warmed up to working temperature is a little higher than the maximum mark.