Audi 80/90/Coupe

Since 1986-1991 of release

Repair and car operation



Audi 80/90/Coupe
+ 1.2. Car identification
+ 2. Engines, carburettors
3. Greasing system
- 4. Cooling system
   4.2. Models with 5-cylinder engines
   4.3. Compartment models
+ 5. Fuel system
+ 6. An exhaust system
+ 7. Ignition system
+ 8. Transmission
+ 9. Suspension brackets, wheels
+ 10. Brake system
+ 11. A steering
+ 12. A body, salon
+ 13. A central air
+ 14. An electric equipment





4. Cooling system

4.1. System of cooling of the engine
THE GENERAL DATA

Radiator in gathering (4-cylinder models)

1. The rubber plug
2. The top hose of a radiator
3. A hose of tap of air
4. Rezinometallichesky
The plug
5. A dilator tank
Test pressure
1,2–1,5 атм
6. The temperature gauge
For inclusion of the fan after a stop of the engine for the purpose of cooling of fuel injectors
And gasoline pipe lines
7. A stopper of a tank of a dilator
8. Spring скоба
9. A radiator casing

10. The electrofan
blowing a radiator
11. The fan electric motor blowing a radiator (water protected)
12. Klinoremennaja transfer of the fan
13. A radiator
At removal remove hoses and disconnect from an arm
Remove a radiator with the fan and the directing device
14. The moment of an inhaling 10 Н.м.
15. An air pipe
16. An arm
17. A sealing ring
18. A fan thermoswitch
19. The bottom hose of a radiator

The prevention

All linings and consolidations are subject to replacement. Hoses without fail fix collars.

Check up system of cooling by means of equipment Snap On SVT 362 and 4467.

If in oil the significant amount of a metal shaving it is necessary to clean oil channels is found out and to replace the oil filter.

All specified details can be removed and established without dismantle of the engine from the car.


The pump of a cooling liquid / the thermostat in gathering (4-cylinder models)

1. The hose union
2. The top hose of a radiator
3. The pump of a cooling liquid
Check up shaft deformation
At a leak or damage replace
4. A lining
5. 20 Н.м.
6. The thermostat
Check immersing in hot water
Temperature of operation 8 With
Temperature of closing 105 With
Piston stroke of a working element not less than 7 mm
7. The bottom hose of a radiator
8. Маслоохладитель
9. A tube of a cooling liquid
10. The temperature gauge
11. 10 Н.м.
12. A sealing ring
13. A sealing washer
14. The temperature gauge

Replacement of a cooling liquid

System of cooling of cars "Audi" of all models are filled on manufacturer with a water and antifreeze mix (G 11) with anticorrosive additives. Such cooling mix can be used all year long.

Antifreeze not containing phosphates raises frost resistance, prevents corrosion and a scaling, and, besides, raises a boiling point. Increase of a boiling point of a cooling liquid improves operational parametres at work with the maximum loading, especially in tropical conditions.

At replacement of a cooling liquid in cars "Audi" of all models irrespective of a year of release it is necessary to fill system of cooling with antifreeze ZVW237 not containing phosphates 102.

Plums of a cooling liquid
PERFORMANCE ORDER
1) translate the handle of management of a heater in position warm
2) remove a stopper of a broad tank
3) merge cooling liquid or through hoses 1, or through the union of the thermostat 2

Refuelling

PERFORMANCE ORDER
1) establish into place and fix hoses
2) fill a broad tank with a cooling liquid to a label maximum
3) close a tank a stopper
4) start the engine and warm up it before the first operation of the fan
5) check up level of a cooling liquid, if necessary restore

Recommended mixes

Freezing point
Antifreeze volume
Water volume
-25 WITH
2,8 l
4,2 l
-35 WITH
3,5 l
3,5 l

The prevention

When the engine is heated-up to normal working temperature, level of a cooling liquid in a broad tank should be a little above a label maximum. When the engine cold, level of a cooling liquid in a broad tank should be between labels minimum and maximum.

It is forbidden to touch fan blades. The fan can join spontaneously at timer operation. In нагретом a motor compartment the cycle of inclusion of the fan can repeatedly repeat after an engine stop.


Automatic inclusion of the fan after an engine stop

Modern cars are equipped by system of automatic start of the fan for cooling of a gasoline pipe line and injectors after an engine stop that facilitates the subsequent start-up of the hot engine.

Principle of work of system

If temperature in space of a motor compartment after an engine stop above 110 With the thermoswitch includes a timer which in turn includes the fan.

When the temperature becomes more low 103 With, the relay disconnects the fan. Such cycle can repeatedly repeat, throughout 10–12 minutes

System details

Thermoswitch

It is mounted on an arm which fastens to a head of the block between 1st and 2nd cylinders (from outside an injector).

Timer

After thermoswitch operation, the timer includes the fan for the first speed of rotation on 10-12 mines after an engine stop.

Fan thermoswitch – operation thresholds
The switch
Temperature of inclusion / of deenergizing
Incl.
Off
Three-chambered, provides connection with a positive pole of the battery, inclusion of the first speed of rotation
92 – 97 WITH
84 – 91 WITH
The second speed of rotation of the fan
99 – 105 WITH
91 – 98 WITH

Search of malfunctions

Timer

It is mounted on an auxiliary guard under the panel of devices on the left side.

Turn the ignition key in position ON and OFF.

Connect to weight of the car a thermoswitch wire.

The fan should join on the first speed of rotation.


The prevention

Test should be executed within 10–12 minutes after an engine stop as the timer works during this period.


Thermoswitch

Position ON – closes contact on weight, when temperature in a motor compartment above 110 With.

Position OFF – contacts are opened, when temperature in a motor compartment more low 103 With.

Electroconducting

By search of malfunctions of an electric chain look subsection 14.3.2.

Тарировка ареометра for antifreeze

For maintenance of accuracy of measurements, it is necessary to check periodically тарировку ареометра.

In a small vessel mix antifreeze and water in the ratio 1:1.

The indication ареометра should be-35 S.Esli the indication differs, put a label corresponding-35 With.

Check of level of a cooling liquid

When the engine is heated-up to normal working temperature, level of a cooling liquid in a broad tank should be a little above a label maximum.

When the engine cold, level of a cooling liquid in a broad tank should be between labels minimum and maximum.


The pump of a cooling liquid / the thermostat in gathering (5-cylinder engines)
1. 20 Н.м.
2. To the top pipe of a radiator
3. 10 Н.м.
4. To the bottom pipe of a radiator
5. An adapter
6. 10 Н.м.
7. A diametrical ring lining
8. The thermostat
Check immersing in hot water
Temperature of operation 87 With
Temperature of closing 102 With
Piston stroke of a working element not less than 8,0 mm
9. A tube of a cooling liquid
10. From a heater radiator
11. To a heater radiator
12. The ventiljatornyj valve
13. 20 Н.м.
14. A diametrical ring lining
15. A thermoswitch
Providing start-up of the fan after an engine stop
Temperature of switching 85 With
16. A lining
17. An adapter
18. A sealing ring
19. The pump of a cooling liquid
Check up shaft deformation
At a leak or damages replace the pump in gathering

Radiator in gathering (5-cylinder engines)
1. A radiator overlay, top
2. 10 Н.м.
3. To an auxiliary radiator
4. A lining
5. 20 H.м
6. The Rezinometallichesky plug, 10 Н.м.
7. A broad tank
Test pressure 1,2–1,5 атм
8. A stopper of a broad tank
9. A radiator
For dismantle remove hoses, turn out the fan thermoswitch
Remove резинометаллические plugs and a radiator overlay
The radiator acts in film in gathering with the fan,
Casing and the directing device

10. The Rezinometallichesky plug, 10 Н.м.
11. The fan thermoswitch
12. A lining
13. The fan
14. To the thermostat
15. A radiator overlay, right
16. To a head of the block of cylinders
17. The Rezinometallichesky plug, 10 Н.м.
18. 10 Н.м.
19. A radiator casing

Fan thermoswitch – operation thresholds
The switch
Temperature of inclusion / of deenergizing
Incl.
Off
Three-chambered, provides connection with a positive pole of the battery, inclusion of the first speed of rotation
92 – 97 WITH
84 – 91 WITH
The second speed of rotation of the fan
99 – 105 WITH
91 – 98 WITH

Тарировка ареометра for antifreeze

For maintenance of accuracy of measurements it is necessary to check periodically тарировку ареометра.

In a small vessel mix antifreeze and water in the ratio 1:1

The indication ареометра should be-35

If the indication differs, put a label corresponding-35

Replacement of a cooling liquid

System of cooling of cars "Audi" of all models are filled on manufacturer with a water and antifreeze mix (G 11) with anticorrosive additives. Such cooling mix can be used all year long.

Antifreeze not containing phosphates raises frost resistance, prevents corrosion and a scaling, and, besides, raises a boiling point. Increase of a boiling point of a cooling liquid improves operational parametres at work with the maximum loading, especially in tropical conditions.

At replacement of a cooling liquid in cars "Audi" of all models, irrespective of a year of release, it is necessary to fill system of cooling with antifreeze ZVW237 102 which are not containing phosphates.

Recommended mixes

Freezing point
Antifreeze volume
Water volume
-25 WITH
3,2 l
4,8 l
-35 WITH
4,0 l
4,0 l

Plums of a cooling liquid

PERFORMANCE ORDER
1) remove a stopper of a broad tank
2) disconnect a heater hose on the block of cylinders
3) disconnect transitive a hose of a tube of a cooling liquid (it is specified by an arrow)

Refuelling
PERFORMANCE ORDER
1) establish into place and fix hoses
2) turn away the screw of the ventilating valve (it is specified by an arrow)
3) fill a broad tank of a cooling liquid to a label maximum
4) when a cooling liquid will start to be poured, wrap the screw of the ventilating valve
5) close a tank a stopper
6) start the engine and warm up it before the first operation of the fan

Components of system of cooling (Compartment model)
1. Consolidation
2. A radiator guard, the top section
3. 10 Н.м.
4. The Rezinometallichesky plug, 10 Н.м.
5. The fan
6. A radiator guard, the right section
7. 20 Н.м.
8. A radiator
9. A sealing washer
10. A thermoswitch, 25 Н.м.
11. A stopper of a broad tank
Check: by means of adaptation VAG 1274 and VAG 1274/1A
Control pressure from 1,2 to 1,5 атм
12. A broad tank
13. A radiator casing
14. To a head of the block of cylinders
15. To the thermostat
16. To an additional radiator


The prevention

Check up leaks in system of cooling by means of adaptation VAG 1274 and VAG 1274/1A.

Replace linings and consolidations. All hoses fix collars with fixing by the screw.


The pump of a cooling liquid / the thermostat in gathering (Compartment model)

1. 20 Н.м.
2. The pump of a cooling liquid
Check up shaft deformation
At a leak or damages – replace
3. A sealing ring
At a leak or damages – replace with a ring repair the size (0,5 mm, number of a detail 069 121 043)
4. The hose union
5. A lining
6. A sealing ring
7. The thermostat
Check immersing in hot water
Temperature of the beginning of opening 87 With
Temperature of full opening 102 With
Course of a working element not less than 8 mm
8. A thermoswitch
It is intended for start of the fan after an engine stop
Operation temperature nearby 85 With
9. To a radiator отпителя
10. To the top radiator
11. To the bottom radiator
12. 10 Н.м.
13. A metal tube of a cooling liquid
14. The ventilating valve
15. From a radiator отпителя

Replacement of a cooling liquid

System of cooling of cars "Audi" of all models are filled on manufacturer with a water and antifreeze mix (G 11) with anticorrosive additives. Such cooling mix can be used all year long.

Antifreeze not containing phosphates raises frost resistance, prevents corrosion and a scaling, and, besides, raises a boiling point. Increase of a boiling point of a cooling liquid improves operational indicators of the engine at work with the maximum loading, especially in tropical conditions.

At replacement of a cooling liquid, or at level restoration to fill cooling system follows antifreeze ZVW237 not containing phosphates 102. It concerns all models of cars "Audi", irrespective of a year of release.

Recommended mixes

Air temperature (not more low)
Water and antifreeze parity
-25 WITH
3:2
-35 WITH
1:1

Plums of a cooling liquid

PERFORMANCE ORDER
1) remove a stopper of a broad tank
2) merge cooling liquid
3) remove a hose of a heater from a back part of the block of cylinders
4) remove the bottom hose of a radiator

Refuelling
PERFORMANCE ORDER
1) open the ventilating valve (it is specified by an arrow)
2) fill in cooling liquid to a label maximum on a broad tank
3) watch liquid receipt through the ventilating valve as soon as the liquid will start to be poured, close the valve
4) close a tank a stopper
5) start the engine and warm up it before the first operation of the fan
6) check up level of a cooling liquid, if necessary воcстановите


The prevention

When the engine is heated-up to normal working temperature, level of a cooling liquid in a broad tank should be a little above a label maximum. When the engine cold, level of a cooling liquid in a broad tank should be between labels minimum and maximum.


Radiator – removal

PERFORMANCE ORDER
1) remove hoses, резинометаллические plugs, the condenser of the conditioner and open a connector of conducting of a thermoswitch
2) disconnect from a radiator the bottom guard and remove a radiator in gathering with a casing and the fan
The prevention

On the models equipped with system of antiblocking (AБС), it is necessary to weaken also fastening of the electric motor of the fan and to displace it forward.



Fan thermoswitch – operation thresholds

The switch
Temperature of inclusion / of deenergizing
Incl.
Off
The first speed of rotation
92 – 97 WITH
84 – 91 WITH
The second speed of rotation of the fan
99 – 105 WITH
91 – 98 WITH