coolant AUDI A4 2000 B5 / 1.G AHA ATQ Engines Cooling System Components Owner's 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
12 -
Coolant hose
13 -
Spring clamp
14 -
Connection
For thermostat
15 -
Oil cooler
16 -
Oil filter
Pa
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g system com
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g and installin
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11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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pair&id=AUDI.B5.GE03.19.1

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 running change
in m.y. 1999, control modules with an after-run
time of 3 minutes were installed.
The coolant after-run pump also continues to
run after the engine is started again before the
15 second or 3 minute cycle is completed.
The coolant after-run pump and the after-run
fan are controlled via the same control module.
After switching off the engine, the after-run pump
always runs for 15 seconds or 3 minutes after the
engine has been switched off. If during this time
the switch-on temperature of 102 C (coolant
temperature) is reached at the thermostat of the
second fan stage, the after-run pump continues
to run and the coolant fan continues to run in the
after-run stage until the switch-off temperature of
91 C of the coolant at thermostat has been
reached. The maximum running time of the after-
run pump is 10 minutes.
Pa
ge 38 of 40 Coolin
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11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
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e=re
pair&id=AUDI.B5.GE03.19.1

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 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.GE03.19.1

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 coolant page 19
-11
.

- Disconnect connection -1-.
- Disconnect both hoses -3- and -4- from pump.
- Unbolt pump from bracket -2-.
Pa
ge 40 of 40 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.GE03.19.1