lock AUDI A6 1999 C5 / 2.G AHA ATQ Engines Cooling System Components Workshop Manual

19-3


7 -
O-ring
Replace if damaged
8 -
Coolant Fan Control (FC) thermal switch -
F18- 35 Nm (26 ft lb)For electric coolant fan
Switching temperatures, stage 1:On: 92-97 C (198-207 F)Off: 84-91 C (183-196 F)
Switching temperatures, stage 2:
On: 99-105 C (210-221 F)Off: 91-98 C (196-208 F)
9 -
Locking bolt
10 -
10 Nm (7 ft lb)
11 -
Fan ring
Clipped into air ducting and secured with
locking 9 bolt
12 -
2-pin harness connector
13 -
Coolant fan -V7- Checking page 19
-26
14 -
Rubber washer
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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 block
5 -
Heater core
6 -
Coolant hose To heat exchanger
7 -
Rear coolant line
8 -
Expansion tank
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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 and other appropriate
protection, cover the cap with a cloth and
open carefully to relieve system pressure
slowly.

- Open coolant expansion tank cap.

- Remove noise insulation panel.
- Place VAG1306 drip tray underneath engine.

- With bumper removed, open coolant drain plug (arrow) on lower left of
radiator by turning it counterclockwise. If necessary, attach accessory
hose to connection.
-
With bumper installed, pull off retaining clamp for lower right radiator
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19-20

Coolant pump, removing and installing


Notes:

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

Removing

- Remove front bumper.

Repair Manual, Body Exterior, Repair Group
63


- Move lock carrier into service position.

Repair Manual, Body Exterior, Repair Group
50


- Remove ribbed belt page 13
-8 .

- Remove toothed belt page 13
-12
.
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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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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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