Audi 80/90/Coupe

Since 1986-1991 of release

Repair and car operation

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