AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owner's Guide

AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owner's Guide A4 2000 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/987/w960_987-0.png AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owner's Guide

Page 31 of 40

AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owners Guide 19-25
      
Viscous fan, removing and installing
 
     
Removing  
    
Installing  
Installation is the reverse of removal, noting the following:  -  Counterhold pulley for viscous fan using 3212 s

Page 32 of 40

AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owners Guide 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 A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owners Guide 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 A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owners Guide 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 35 of 40

AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owners Guide 19-29
      
Pressure relief valve in cap, checking  
     
-  Attach sealing cap to tester using VAG1274/9 
adapter. 
    
-  Install hand pump and pump.
-  Pressure relief valve must open at pressur

Page 36 of 40

AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owners Guide 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

Page 37 of 40

AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owners Guide 19-31
 
  
6 - 
Spring clamp 
7 - 
Coolant hose 
8 - 
Spring clamp 
9 - 
Electrical after-run coolant pump 
Checking  page 19
-32
Removing and installing   page 19
-34
10 - 
10 Nm 
11 - 
Spring clamp

Page 38 of 40

AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owners Guide 19-32
      
After-run coolant pump, checking
 
     
Note:  
     
Control modules with an after-run time of 15 
seconds after engine is turned off were installed 
since start of production. As a run

Page 39 of 40

AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owners Guide 19-33
 
    
The control module for the after-run pump and coolant fan is installed 
below the longmember (left side)  
    
The thermostat is installed in the coolant return hose.  
Pa
ge 39 of 40 Co

Page 40 of 40

AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owners Guide 19-34
      
After-run coolant pump, removing and 
installing
 
    
Note:  
The electrical coolant pump is located on the right side behind the 
generator.  -  Remove noise insulation panel.
- Drain
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