AUDI A4 1998 B5 / 1.G AWM Engine Cooling System Components User Guide

cooling system.
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19-9

Recommended mixture ratios:

Frost
protection
to
Anti-freeze
concentration
G
012A8
D 1)
Water
1)
-25 C
-35 C
40%
50% 3.0 l
3.5 l 4.0 l
3.5 l

1) Coolant quantity: 7.0 liters (may vary
depending upon the vehicle equipment)

- Install lower coolant hose and secure.

Note:
To fill expansion tank without special tools, remove expansion tank and
temporarily raise it about 100 mm. - Screw adapter VAG 1274/8 onto coolant expansion tank.
- Fit special tool VAG 1274/10 onto adapter.
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19-10


- Remove seal from plenum chamber cover in direction of arrow.
- Remove plenum chamber cover -1- from front.
- Push back protective cover for coolant hose at connection of heat
exchanger.

- Release coolant hose to heat exchanger and pull back hose until
bleeder hole in coolant hose -arrow- is no longer covered by
connection.
- Top up coolant until it flows out at bleeder hole in coolant hose.
- Push coolant hose on connection and tighten.
- Install expansion tank cap.
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19-11

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

- Allow engine to run at idling speed until lower
hose on radiator becomes hot.

WARNING!

Hot steam can escape when opening the cap
on the expansion tank: Cover cap with a cloth
and open carefully.

- Check coolant level and top up if necessary. If
engine is warm, coolant level must be at max.
mark; if cold, between min. and max. marks.

- Stop engine.
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19-12

Coolant pump, removing and installing


Special tools and equipment

Socket head fastener T10092

Pin T40011
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19-13

Removing

Engine in vehicle.
Lock carrier must be in service position
Page 13
-1 .

- Drain coolant Page 19
-4 .

- Remove ribbed belt and tensioner for ribbed belt
Page 13
-18
.

- Secure pulley for viscous fan with pin punch -1- and unfasten using
Allen key -2-.
- Remove viscous fan from mounting.

- Remove engine cover -arrows-.
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19-14

- Mark direction of rotation of belt with chalk or felt
pen.

- Remove top and center toothed belt guard
Page 13
-35
.

- Set crankshaft to markings for TDC of No. 1 cylinder by turning central
bolt on crankshaft sprocket in direction of rotation -arrows-.

Note:
Only tension pressure piston of tensioner until the piston is secured with
pin T40011. - Thread socket head fastener T10092 into tensioner for toothed belt.
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19-15

- Take toothed belt off camshaft sprocket and
coolant pump.

Note:

The vibration damper and lower toothed belt
guard do not have to be removed.
The toothed belt should be left in position on
the crankshaft sprocket.
Before removing the coolant pump, cover
toothed belt with a cloth to protect from coolant.

- Remove coolant pump securing bolts -1- and remove coolant pump -2-.
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19-16

Installing
Installation is carried out in the reverse order of
removal; note the following:

Note:
Always replace seals and gaskets.

- Clean and smooth down sealing surface for O-
ring as required.

Note:
Observe all instructions on removing and installing the toothed belt
Page 13
-40
. - Lightly coat new O-ring -3- with coolant G 012 A8 D.
- Install coolant pump -2-.

Installation position: Sealing plug in housing faces downward.
- Tighten bolts -1- of coolant pump to 15 Nm.
- Install toothed belt (adjust valve timing) Page 13
-44
.
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19-17

- Install ribbed belt and tensioner for ribbed belt
Page 13
-20
.

- Install viscous fan Page 13
-21
.

- Install lock carrier Page 13
-1 .

- Top up coolant Page 19
-7 .

Tightening torque

Component

Nm
Coolant pump to cylinder block 15
Center section of toothed belt guard to
cylinder block
10
1)
Hose clamps for coolant hoses 2

1) Install with locking fluid D 000 600 A2
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