AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide

AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide A4 1999 B5 / 1.G AUDI AUDI https://www.carmanualsonline.info/img/6/987/w960_987-0.png AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide

Page 11 of 40

AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide 19-9
 
  
Coolant hose connection diagram
 
1 - 
Lower coolant hose 
From radiator to engine
2 - 
Cylinder head/cylinder block 
3 - 
Intake manifold 
4 - 
Coolant line From heat exchanger to engine bl

Page 12 of 40

AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide 19-10
 
  
9 - 
Oil cooler 
10 - 
Coolant line 
From expansion tank to lower coolant pipe
11 - 
Upper coolant hose 
12 - 
Radiator 
13 - 
Coolant pump 
14 - 
Lower coolant line 
15 - 
Connection For t

Page 13 of 40

AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide 19-11
      
Cooling system, draining and refilling
 
     
Draining  
     
WARNING! 
     
The cooling system is pressurized when the 
engine is warm. When opening the expansion 
tank, wear gloves a

Page 14 of 40

AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide CAUTION! 
Follow disposal regulations for coolant.  hose (from radiator to engine) and disconnect radiator hose from 
radiator. 
Pa
ge 14 of 40 Coolin
g system com
ponents, removin
g and installin
g
1

Page 15 of 40

AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide 19-12
 
    
Filling  
Notes:  -  Drain engine coolant at drain plug (arrow).
Only use coolant additive G12 (according to TL VW 7745 D). G12 is 
red in color. Do not mix G12 with any other coolant add

Page 16 of 40

AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide 19-13
      
Note (continued from page   Page 19
-12
 ):  
     
If for climatic reasons greater frost protection is 
required, the amount of G 12 can be increased, 
but only up to 60% (frost protecti

Page 17 of 40

AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide 19-14
      
-  Replace coolant drain plug O-ring and install 
coolant drain plug into engine. 
     
   Tightening torque: 20 Nm (15 ft lb).
     
-  Install lower right coolant hose and secure with

Page 18 of 40

AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide 19-15
 
    
-  Loosen bleeder screw on lower coolant line (arrow) under expansion 
tank (if necessary, unbolt expansion tank). 
-  Top off coolant until it flows out from bleeder screw.
-  Close blee

Page 19 of 40

AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide 19-16
      
-  Raise engine speed to approx. 2000 rpm for 
approx. 5 minutes. 
     
-  Allow engine to idle until lower coolant hose on 
radiator is hot. 
     
-  Check coolant level and top-off if

Page 20 of 40

AUDI A4 1999 B5 / 1.G AHA ATQ Engines Cooling System Components User Guide 19-17
      
Radiator, removing and installing
 
     
Removing  
     
-  Remove front bumper. 
     
       Repair Manual, Body Exterior, Repair Group 
63
   
    
-  Drain coolant at drain plug (ar
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