AUDI A4 1999 B5 / 1.G APB Engine Cooling System Components

19-10


10 -
Top coolant hose
Secured to radiator with retaining clipCheck for secure seatingDiagram of coolant hose connections
Page 19
-17

11 -
Coolant line
Diagram of coolant hose connections
Page 19
-17

12 -
Rear toothed belt guard
13 -
Gasket
Always replace
14 -
Coolant pump Check that pump runs freelyIf damaged or leaking replace completeRemoving and installing Page 19
-29
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19-11


15 -
To front coolant line
Diagram of coolant hose connections
Page 19
-17

16 -
Bolt
Tightening torque: 10 Nm
17 -
Bolt Tightening torque: 25 Nm
18 -
Lower coolant line Diagram of coolant hose connections
Page 19
-17

19 -
Oil cooler
20 -
Bolt
Tightening torque: 25 Nm
21 -
Bolt Tightening torque: 10 Nm
22 -
Belt pulley For viscous fan
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19-12


23 -
Bolt
Tightening torque: 10 Nm
24 -
Fan wheel for viscous fan
25 -
Viscous fan coupling Note left-hand threadTightening torque only applicable when
using open-end spanner 3312 Tighten to 37 Nm
26 -
Bolt Tightening torque: 25 Nm
27 -
Bracket For viscous fan
28 -
From bottom of radiator Diagram of coolant hose connections
Page 19
-17

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19-13


Cooling system components (on engine,
rear), removing and installing

1 -
To front water hose
2 -
Front coolant line
Diagram of coolant hose connections
Page 19
-17

3 -
Bleeder screw
Tightening torque: 20 Nm
4 -
Coolant hose From auxiliary water pump to front coolant
line
5 -
Auxiliary water pump
6 -
Coolant hose From rear coolant line to auxiliary water
pump
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19-14


Repair Manual, 2.7 Liter V6 5V BiTurbo Fuel
Injection & Ignition, Engine Code(s): APB, Repair Group 01
7 -
Right coolant line From turbocharger to rear coolant line
8 -
Banjo bolt Tightening torque: 35 Nm
9 -
Coolant temperature sender (-G62-) For engine control moduleIf necessary, release pressure in cooling
system before removing Checking:
10 -
Retaining clip
Check for proper seating
11 -
To heat exchanger
12 -
Rear coolant line Diagram of coolant hose connections
Page 19
-17

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19-15


13 -
Bolt
Tightening torque: 10 Nm
14 -
Right coolant line From engine block to turbocharger
15 -
Banjo bolt Tightening torque: 35 Nm
16 -
Banjo bolt Tightening torque: 35 Nm
17 -
Right coolant line From engine block to turbocharger
18 -
From heat exchanger
19 -
To front coolant hose
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19-16


20 -
Coolant line
Diagram of coolant hose connections
Page 19
-17

21 -
Bleeder screw
Tightening torque: 20 Nm
22 -
Banjo bolt Tightening torque: 35 Nm
23 -
Left coolant line From turbocharger to rear coolant line
24 -
Sender for auxiliary water pump 2-pinIf necessary, release pressure in cooling
system before removing
25 -
To oil cooler
26 -
Retaining clip Check for proper seating
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19-17


Coolant hose connections, diagram

1 -
Bottom coolant hose
From radiator to engine
2 -
Cylinder head/ cylinder block
3 -
Right turbocharger
4 -
Auxiliary water pump
5 -
Heat exchanger for heater system
6 -
Coolant hose To heat exchanger
7 -
Left turbocharger
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19-18


8 -
Rear coolant line
9 -
Cap for expansion tank
10 -
Expansion tank
11 -
Oil cooler
12 -
Radiator
Removing and installing Page 19
-26
After replacing, replace coolant in complete
system
13 -
Coolant pump
14 -
Connection For thermostat
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19-19

Cooling system, draining and filling


Draining

WARNING!

Hot steam can escape from the expansion
tank when the filler cap is opened. Cover the
filler cap with a cloth and remove it carefully.

- Remove filler cap on coolant expansion tank.

- Remove noise insulation panel.
- Place drip tray VAG 1306 under the engine.

- If bumper has been removed from vehicle, open drain tap -arrow- on
bottom of radiator (left side) by turning anti-clockwise. Fit drain hose on
connection if necessary.
- If bumper has not been removed from vehicle, pull out retaining clip on
bottom hose going from radiator to engine (right side), and pull hose off
radiator.
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