AUDI A4 1997 B5 / 1.G APB Engine Cooling System Components
  A4 1997 B5 / 1.G
  AUDI
  AUDI
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  AUDI A4 1997 B5 / 1.G APB Engine Cooling System Components
            
        
  
 
Page 5 of 34
19-4
 
  
7 - 
Retaining bolt 
8 - 
Nut 
Tightening torque: 10 Nm
9 - 
Fan ring Clipped into air ducting and secured with 
retaining bolt -Item 7 - 
10 - 
2-pin connector 
11 - 
Radiator fan (-V7-) 
12 - 
Connector Black, 3-pinFor radiator fan thermoswitch
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        Page 6 of 34
19-5
 
  
13 - 
Radiator fan thermoswitch (-F18-), 35 Nm 
For electric fan
  Switching temperatures: Stage 1on: 92...97 Coff: 84...91 C
  Switching temperatures: Stage 2
on: 99...105 Coff: 91...98 C
14 - 
Seal 
Always replace
15 - 
Drain screw Tightening torque: 10 Nm
16 - 
Top coolant hose Secured to radiator with retaining clipCheck for secure seatingDiagram of coolant hose connections   
Page 19
-17
 
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        Page 7 of 34
19-6
 
  
17 - 
Bolt 
Tightening torque: 5 Nm
18 - 
Mounting rod 
19 - 
Guard plate 
20 - 
Bolt Tightening torque: 5 Nm
21 - 
Bolt Tightening torque: 5 Nm
22 - 
Radiator Removing and installing   Page 19
-26
After replacing, replace coolant in complete 
system 
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        Page 8 of 34
19-7
 
  
23 - 
Nut 
Tightening torque: 5 Nm
24 - 
Bracket 
25 - 
Fan ring 
26 - 
Pressurizing fan 
27 - 
Bolt Tightening torque: 5 Nm
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        Page 9 of 34
19-8
 
  
Cooling system components (on engine, 
front), removing and installing
 
1 - 
Connection 
For thermostat
2 - 
O-ring Always replace
3 - 
Thermostat Checking: heat the thermostat in waterStarts to open at about 86 COpening travel: at least 7 mm
4 - 
Bolt Tightening torque: 10 Nm
Pa
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        Page 10 of 34
19-9
 
  
5 - 
Filler cap 
Test with cooling system tester VAG 1274 
and adapter VAG 1274/9 Test pressure 1.4...1.6 bar
6 - 
O-ring Replace if damaged
7 - 
Bolt Tightening torque: 10 Nm
8 - 
Expansion tank Carry out leak test of cooling system with 
cooling system tester VAG 1274 and 
adapter VAG 1274/8 
9 - 
To rear water line Diagram of coolant hose connections   
Page 19
-17
 
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ponents, removin
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        Page 12 of 34
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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        Page 13 of 34
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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        Page 14 of 34
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 
Pa
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ponents, removin
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        Page 15 of 34
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
 
Pa
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ponents, removin
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11/21/2002 htt
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