ect AUDI A6 1998 C5 / 2.G AHA ATQ Engines Cooling System Components Owner's Manual

- Remove toothed belt page 13
-12
.

- Remove connection mounting bolts -1- and remove connection -2-.
- Remove thermostat -4-.
Pa
ge 29 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

19-24

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 block.
- Moisten new O-ring -3- with coolant.

- Install connection -2- for thermostat and tighten bolt -1- to 10 Nm (7 ft
lb).
- Install and tension toothed belt page 13
-12
.
- Install ribbed belt page 13
-8 .
- Fill cooling system with coolant page 19
-11
.
Pa
ge 30 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

19-26

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 Fan Control (FC)
thermal switch -F18- at bottom left of radiator.
- Switch ignition on.

- Bridge terminal -1- and terminal -2- of harness connector using
auxiliary cables from VW1594 connector test kit.
Coolant fan -V7- must run on 1st speed.
Pa
ge 32 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

19-27


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 harness connector using
auxiliary cables from VW1594 connector test kit.
Coolant fan -V7- must run on 2nd speed.
- Locate and repair open circuit using wiring diagram:- Replace coolant fan -V7-.
Pa
ge 33 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

19-28

Cooling system, pressure test


Engine at operating temperature

WARNING!

The cooling system is pressurized when the
engine is warm. When opening the expansion
tank, wear gloves and other appropriate
protection, cover the cap with a cloth and
open carefully to relieve system pressure
slowly.

- Open cap on coolant expansion tank.

- Using VAG1274/8 adapter attach VAG1274 cooling system tester to
coolant expansion tank.
- Use tester hand pump to create a pressure of approx. 1.0 bar (14.5
psi).
- If pressure falls, check for leaks and repair.
Pa
ge 34 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

19-31


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
ge 37 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