1998 AUDI A4 AWM Engine Cooling System Components Workshop Manual

system must be filled all year round with the
correct anti-freeze and anti-corrosion additive.
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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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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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