AUDI A3 1998 8L / 1.G AEB ATW Engines Cooling System Components User Guide

19-10

- Start engine and maintain an engine speed of
about 2000 RPM for approx. 3 minutes.

- Allow engine to idle until the lower radiator hose
is hot.Check coolant level and top up if
necessary. When engine is at normal operating
temperature, coolant level must be at max.
mark; when engine is cold, between min. and
max. marks.

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 using a cloth, and
open carefully to relieve system pressure
slowly.

- Switch engine off.
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19-11


Coolant pump and coolant thermostat,
servicing

1 -
Bolt
M6: 10 Nm (7 ft lb)M8: 20 Nm (15 ft lb)
2 -
Lower toothed belt cover Removing and installing Page 13
-29
3 -
Nut
10 Nm (7 ft lb)
4 -
Coolant pump Removing and installing Page 19
-13
Check for ease of movement
5 -
Gasket Always replace
6 -
O-ring Always replace
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19-12


7 -
T-head bolt
Insert before installation
8 -
Coolant thermostat Removing and installing Page 19
-20
Checking Page 19
-20
9 -
Connector
10 -
Drain plug
30 Nm (22 ft lb)
11 -
O-ring Always replace
12 -
Belt pulley Installed position: flat pulley half faces
coolant pump
13 -
Socket-head bolt 25 Nm (18 ft lb)
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19-13

Coolant pump, removing and installing


Note:
Coolant pump is bolted to bracket for generator,
power steering pump and viscous fan.

Lock carrier in service position Page 13
-1

Removing

CAUTION!

Before disconnecting the battery:

Stop the engine.
Determine the correct coding for the anti-
theft radio.
Switch the ignition off (also applies when
connecting the battery). Failure to do so may
damage the Engine Control Module (ECM).

- Switch ignition off and disconnect battery Ground (GND) strap.
- Remove ribbed belt Page 13
-15
.
- Remove viscous fan (with belt pulley) Page 13
-14
, Fig. 1
.
- Remove V-belt Page 13
-18
.
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Note:
Ribbed belt for A/C compressor and torque support remains installed.
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19-14

- Drain coolant Page 19
-4 .

- Loosen clamps for coolant hoses -1- and -2-.
- Remove coolant hose to radiator at coolant line.
- Remove intake air duct between intake manifold and charge air cooler.
- Remove mounting bolts for generator.
- Remove generator toward front.
- Disconnect wiring from removed generator.
- Unbolt following supports and braces from bracket for generator, power
steering pump and viscous fan:

Intake manifold support
Support for torque support bracket
Brace to cylinder block (remove completely)

- Remove bracket for generator, power steering pump and viscous fan
bolts -1- through -6-.
- Secure bracket for generator, power steering pump and viscous fan to
left side using wire.
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19-15

Note:
Power steering pump remains installed.

- Pull off coolant hoses from coolant pump and
coolant thermostat housing.

- Unbolt coolant pump housing from toothed belt cover (arrow).
- Remove coolant pump.

- Unbolt impeller housing -1- from pump housing -4-.
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19-16

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

- Clean sealing surfaces of both housings.

- Replace gasket and O-ring.

- Insert T-head bolt into coolant pump bore.

- Mount bracket for generator, power steering pump and viscous fan with
coolant pump on cylinder block and tighten bolts in numerical
sequence.
1 - M8 x 70 bolt
2 - M8 x 110 bolt
3 - M8 x 50 bolt
4 - M8 x 90 bolt
5 - M8 x 70 bolt
6 - M8 x 100 bolt
- Install viscous fan Page 13
-14
, Fig. 1
.
- Install ribbed belt Page 13
-17
.
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19-17

Note:
When installing ribbed belt, check for correct
seating on belt pulley.

- Install V-belt Page 13
-18
.

- Fill up with coolant Page 19
-6 .

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 using a cloth, and
open carefully to relieve system pressure
slowly.

CAUTION!

Be sure the ignition is switched OFF. Failure
to do so may damage the Engine Control
Module (ECM).

- Switch ignition off and reconnect battery Ground
(GND) strap.

- After connecting battery, enter anti-theft code for
radio.

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Radio Operating Manual
- Fully close power windows to stop.

- Operate all power window switches again for at
least one second in "close" direction to activate
"one-touch" opening/closing function.

- Set clock to correct time.
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