Audi 80/Avant (B4)

Since 1991-1995 of release

Repair and car operation

Audi 80/Avant
+ The description
+ Engines
+ System of release of the fulfilled gases
- Cooling system
   Check of level of a cooling liquid
   Frost resistance check
   Check of system of cooling on tightness
   Carving cover of a broad tank
   The thermostat
   The list of malfunctions
   The water pump
   Klinovoj belt of the water pump
   The fan of system of cooling
   Malfunctions of the fan of system of cooling
   The list of malfunctions
+ Fuel tank and the fuel pump
+ The air filter and воздухозаборные channels
+ Injection system
+ Coupling
+ Transmission and transmission
+ Suspension bracket and steering
+ Brake system
+ Antiblocking system of brakes
+ Wheels and tyres
+ Kuzovnaja electrosystem
+ Ignition system
+ Illumination
+ Signalling devices
+ Devices and auxiliary devices
+ Heating and ventilation
+ Body elements
+ Search of malfunctions
+ Specifications



The radiator is supplied by 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 the cooling liquid directs through aluminium tubes of a radiator which for increase in their surface (and by that the cooling areas) are supplied by cooling edges. Through cooling edges the cooling liquid gives heat to atmosphere.

At suspicion on not tight radiator you should spend the described check by pressure in a workshop. 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) radiators. The radiator of the 6-cylinder engine is established in the same way.


    To remove the bottom protection of a motor compartment (the head body Elements). To merge cooling liquid. To remove from a radiator all hoses. To disconnect tips of wires on a thermoswitch of the fan of system of cooling. To remove tips of the fan of system of cooling. Models with 4 and 6-cylinder engines: to turn out fixing bolts/nuts above and below on both parties of a radiator. To press a radiator it is a little back and to take out together with the fan. Models with 5-cylinder engines: to remove the top protection of a radiator. For this purpose to turn away nuts/bolts and to extend protection from forward fastenings. 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. Completely to unscrew a fixing partition on the right party of a radiator. To unscrew the bottom fastening of a radiator. To take out a radiator upwards.

The bolts specified here by arrows and nuts it is necessary to turn on 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 specifies in a carving stopper of a ventilating aperture in a branch pipe of system of cooling of the 5-cylinder engine. The 6-cylinder engine also is supplied by this stopper.

At the left: for plum of a 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 aperture on a radiator.

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

Additional radiator

In certain variants of equipment – for example, the conditioner, the tjagovo-drawbar, the strengthened cooling – the 5-cylinder engine is equipped by 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:


    To remove the bottom protection of a motor compartment (the head body Elements). To merge cooling means. To disconnect from a radiator hoses of system of cooling. 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 radiator surface should be cleared of the rests which have pressed there of insects, cooling action otherwise worsens.


    To open a cowl, at the 5-cylinder engine in addition to remove a protective casing of a radiator from above. The dried up rests of insects to sprinkle the means dissolving fiber (for example Summer Screen firms Holts). Through certain time of action to sprinkle the same means a radiator underside. To wash out a radiator not strong stream of water. The rigid brush or the sharp tool can damage a radiator surface. To direct a hose with water to apertures round the fan of system of cooling. To raise rubber protective заглушки there where are established, and to direct a water stream to the apertures located behind them.

Removal of hoses of system of cooling

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


    To merge cooling means. Turned off collars to weaken by means of a screw-driver. Spring collars to compress on both "ears" by means of nippers against the stop. To remove hoses. 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 cautiously to operate with it as the lever. New hoses to put on branch pipes досточно it is deep, that they could not slide off. To tighten twisting collars, without applying special efforts, differently it is possible to strip a thread.

 The 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 a trouble, applying Pannenband firms Weyer or Hoseweld Bandage firms Holts. Both tapes are well pasted to the cleared and dry rubber hoses. At the big leak sometimes happens it is useful to open a cover of a broad tank on one turn that in cooling system pressure to which the bandage cannot resist could not be formed. Now it is possible to go very cautiously to a workshop, constantly watching indications of gauges of temperature and level of a cooling liquid.

Plums of a cooling liquid


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

 The help: antifreeze is poisonous, therefore it cannot be lowered simply in the water drain. Instead it is necessary to collect it in special capacity and to hand over as special dust.

Refuelling of system of cooling

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


    Before filling to open a carving stopper of a ventilating aperture in a heater hose. Only the 6-cylinder engine: to turn out ahead at the engine a carving stopper on the pipeline with a cooling liquid. At first to fill in antifreeze, then whenever possible distilled water while level will not rise to an upper edge of a broad tank. To pour a liquid until it will not act from a stopper. Then to add completely. Only the 4-cylinder engine: the top water hose to a radiator slightly to raise, while the cooling liquid will be filled in. To wrap a carving cover of a broad tank. To get the engine and to leave it to work until the electric fan of system of cooling will join. To switch off the engine and to add cooling liquid. Liquid level should be between marks min and max a broad tank; at разогретом to working temperature the engine it is a little above the maximum mark.