1995 AUDI A8 AHA ATQ Engines Cooling System Components Workshop Manual

- Drain coolant page 19
-11
.
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19-21


- Remove the following components before removing coolant pump:
1 - Toothed belt tensioner roller
Tightening torque: 20 Nm (15 ft lb)
2 - Idler roller
Tightening torque: 45 Nm (33 ft lb)


- Remove coolant pump mounting bolts -1- and remove coolant pump -
2-.
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19-22

Installing
Installation is the reverse of removal, noting the
following:

- Remove any remaining sealant from sealing
surfaces of coolant pump and cylinder block.

- Clean sealing surfaces so they are completely
free of any oil or grease.

- Install new gasket on water pump flange.

- Install coolant pump -2- into cylinder block and tighten all 9 mounting
bolts (arrow -2-) to 10 Nm (7 ft lb).
- Install rear toothed belt guard on water pump housing (arrow -1-).
Tightening torque: 10 Nm (7 ft lb).
- Install and tension toothed belt page 13
-12
.
- Install toothed belt guard.
- Install ribbed belt page 13
-8 .
- Fill cooling system with coolant page 19
-11
.
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19-23

Thermostat, removing and installing


Notes:

Always replace seals and gaskets.
Cover the toothed belt with a cloth to protect it
from coolant before removing thermostat.

Removing

- Drain coolant page 19
-11
.

- Remove front bumper.

Repair Manual, Body Exterior, Repair Group
63


Lock carrier in service position

Repair Manual, Body Exterior, Repair Group
50


- Remove ribbed belt page 13
-8 .
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- Remove toothed belt page 13
-12
.

- Remove connection mounting bolts -1- and remove connection -2-.
- Remove thermostat -4-.
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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
.
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11/21/2002 htt
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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 spanner wrench and
remove viscous fan using 3312 open-end spanner (left thread).
- Carefully lift out viscous fan.Tightening torque for viscous fan
Nm
1331 torque wrench and 3312 open-end spanner 37 Nm (27 ft lb)
1331 torque wrench without 3312 open-end spanner 70 Nm (52 ft lb)
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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.
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