radiator cap AUDI A4 1997 B5 / 1.G APB Engine Cooling System Components
[x] Cancel search | Manufacturer: AUDI, Model Year: 1997, Model line: A4, Model: AUDI A4 1997 B5 / 1.GPages: 34, PDF Size: 0.64 MB
Page 19 of 34

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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11/21/2002 htt
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Page 20 of 34

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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Page 23 of 34

19-22
      
The coolant concentration should not be 
reduced by adding plain water, even in warmer 
seasons and in warmer countries. The 
concentration must be at least 40 %. 
     If extra antifreeze protection is required in cold 
climates, the concentration of G 12 can be 
increased, but only up to a maximum of 60 % 
(frost protection to about -40 C); if this 
concentration is exceeded, the antifreeze 
protection will be reduced again and cooling 
effectiveness will also be impaired. 
     
Do not reuse the old coolant if the radiator, heat 
exchanger, cylinder head or cylinder head 
gasket have been replaced. 
      Recommended mixture ratios:  
     
Frost 
protection 
to  Antifreeze 
concentration  G 
12
1)  Water
1)  
-25 C  
-35 C  
40 %  
50 %  2.5 
ltr.  
3.0 
ltr.  3.5 ltr.  
3.0 ltr.  
     
1) The capacity of the cooling system can vary 
depending on the equipment installed on the 
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Page 27 of 34

19-25
      
-  Start engine and let it idle for about 10 
minutes. 
     
-  Maintain an engine speed of about 2000 RPM 
for about 5 minutes. 
     
-  Allow engine to run at idling speed until bottom 
hose on radiator becomes hot. 
     
-  Check coolant level and top up if necessary. 
When engine is at normal operating temperature 
coolant level must be on max. mark, and 
between min. and max. marks when engine is 
cold. 
     
Note:  
     When the engine is hot the cooling system is 
under pressure. Carefully open filler cap on 
expansion tank to release pressure before 
starting repair work. 
     
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. 
Pa
ge 27 of 34 Coolin
g system com
ponents, removin
g and installin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE05.19.1