coolant AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owner's Manual

AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owner's Manual A8 1998 D2 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/987/w960_987-0.png AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owner's Manual

Page 24 of 40

AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owners Manual 19-20
      
Coolant pump, removing and installing
 
     
Notes:  
     
Always replace seals and gaskets.
     Cover the toothed belt with a cloth to protect it 
from coolant before removing the coo

Page 25 of 40

AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owners Manual      
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Page 26 of 40

AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owners Manual 19-21
 
    
-  Remove the following components before removing coolant pump:
1 - Toothed belt tensioner roller
  Tightening torque: 20 Nm (15 ft lb)
2 - Idler roller
  Tightening torque: 45 Nm (33 ft

Page 27 of 40

AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owners Manual 19-22
      
Installing  
      Installation is the reverse of removal, noting the 
following:  
     
-  Remove any remaining sealant from sealing 
surfaces of coolant pump and cylinder block.

Page 28 of 40

AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owners Manual 19-23
      
Thermostat, removing and installing
 
     
Notes:  
     
Always replace seals and gaskets.
     Cover the toothed belt with a cloth to protect it 
from coolant before removing thermosta

Page 30 of 40

AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owners Manual 19-24
      
Installing  
      Installation is the reverse of removal, noting the 
following:  
    
Bleeder valve for thermostat (arrow) must be at the top. 
-  Install thermostat -4- into engine bl

Page 32 of 40

AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owners Manual 19-26
      
Coolant fan, checking
 
     
Test requirements  
    
Test procedure  
Fuse No. 34 OK Coolant Fan Control (FC) thermal switch -F18- OK 
-  Disconnect 3-pin harness connector from coolant

Page 33 of 40

AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owners Manual 19-27
 
    
If 1st or 2nd fan speed does not run:  
 Electrical Wiring Diagrams, Troubleshooting & Component Locations   
If no open circuit can be found:  -  Bridge terminal -1- and terminal -3- of

Page 34 of 40

AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owners Manual 19-28
      
Cooling system, pressure test
 
     
Engine at operating temperature 
     
WARNING! 
     
The cooling system is pressurized when the 
engine is warm. When opening the expansion 
tank,

Page 36 of 40

AUDI A8 1998 D2 / 1.G AHA ATQ Engines Cooling System Components Owners Manual 19-30
 
  
After-run coolant pump
 
1 - 
Coolant reservoir 
Perform coolant system leak test using 
VAG1274 cooling system tester and 
VAG1274/9 adapter. 
2 - 
Lower coolant pipe 
3 - 
25 Nm 
4 - 
25
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