radiator AUDI A4 1998 B5 / 1.G AWM Engine Cooling System Components Workshop Manual

19-2


Cooling system diagram

1 -
Radiator
Removing and installing Page 19
-26
After replacing, fill with fresh coolant
2 -
Upper coolant line
3 -
Thermostat Removing and installing coolant pump
Page 19
-12

Checking Page 19
-22
4 -
Coolant pump
Removing and installing Page 19
-12
Check for ease of movement
5 -
Turbocharger
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19-5

Draining

Note:
Catch drained off coolant in a clean container for
re-use or disposal.

WARNING!

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

- Open cover of coolant expansion tank

- Remove sound insulation -arrows-.
- Place drip tray VAG 1306 below engine.

- Remove lower coolant hose retaining clip -arrow- and remove coolant
hose from radiator.
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19-6

Note:

With bumper and air duct in front of charge air cooler removed, the
coolant can also be drained from the radiator via the drain screw -arrow-.
If necessary use an auxiliary hose.

- Disconnect lower coolant hose on oil cooler -arrow-, and drain off
remaining coolant.
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19-8

Because of its high boiling point, the coolant
improves engine reliability under heavy loads,
particularly in countries with tropical climates.
Protection against frost must be assured to
about -25 C (in arctic climatic countries to
about -35 C).

The coolant concentration must not be reduced
by adding water, even in warmer seasons and
in warmer countries. The anti-freeze ratio must
be at least 40 %.
If greater frost protection is required in very cold
climates, the amount of G 012 A8 D can be
increased, but only up to 60% (this gives frost
protection to about -40 C). Otherwise, frost
protection is reduced again and cooling
effectiveness is also reduced.

Only use clean drinking water for mixing the
coolant.
If radiator, heat exchanger, cylinder head or
cylinder head gasket is replaced, do not reuse
old coolant.
Use special tool T10007 to check frost
protection of coolant additive G012 A8 D in
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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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19-19


- Secure pulley for viscous fan with pin punch -1- and unfasten using
Allen key -2-.
- Remove viscous fan from mounting and place in front of radiator cowl.
- Disconnect wiring from rear of Generator.
- Loosen connections for Generator from top and bottom and remove
Generator.

- Remove intake line support -arrows-.
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19-26

Radiator, removing and installing


Special tools and equipment

Removing
Repair Manual, Body Exterior, Repair Group 63

VAG 1306
- Remove front bumper:

- Remove air cowl in front of charge air cooler -arrows-.
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19-27


WARNING!
Hot steam can escape when opening the cap on the expansion tank:
Cover cap with a cloth and open carefully. - Disconnect cooling lines for power steering hydraulic fluid -arrows-.
- Open cover of coolant expansion tank
- Place drip tray VAG 1306 below engine.

- Turn drain screw -arrow- on radiator counter-clockwise. If necessary,
install a drain hose on connection.
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19-28


- Release coolant hose retaining clip -arrow- and remove coolant hose
from radiator.

- Disconnect coolant hose from top of radiator -arrow-.
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19-29

Vehicles with automatic transmission:

Note:
Observe cleanliness rules when working on the automatic transmission:
Repair Manual, 5 Spd. Automatic Transmission 01V, Repair Group 37

Repair Manual, 5 Spd. Automatic Transmission 01V, Repair Group 37
All models:
CAUTION!
The air conditioner refrigerant circuit must not be opened. - Remove bolts -arrows-.
- Remove air duct -1- and -2-.
- Place drip tray underneath to collect oil.
- Remove ATF lines/hoses from radiator:- Tie ATF lines to longitudinal member to avoid leakage of fluids.
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