warning AUDI A4 1998 B5 / 1.G APB Engine Cooling System Components

19-1


Cooling system components,
removing and installing

WARNING!

Hot steam can escape from the expansion
tank when the filler cap is opened. Cover the
filler cap with a cloth and unscrew it carefully.

Notes:

When the engine is hot the cooling system is
under pressure. Carefully open filler cap on
expansion tank to release pressure before
starting repair work.
Hoses are secured with spring-type clips. When
repairing only use spring-type clips.
VAG 1921 pliers are recommended when
installing spring-type clips.
The O-rings fitted at the quick-release
connections must be replaceed if damaged or
leaking.
When installing coolant hoses, ensure that they
are free of stress and do not come into contact
with other components (observe markings on
coolant connection and hose).
Pa
ge 1 of 34 Coolin
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19-19

Cooling system, draining and filling


Draining

WARNING!

Hot steam can escape from the expansion
tank when the filler cap is opened. Cover the
filler cap with a cloth and remove it carefully.

- Remove filler cap on coolant expansion tank.

- Remove noise insulation panel.
- Place drip tray VAG 1306 under the engine.

- If bumper has been removed from vehicle, open drain tap -arrow- on
bottom of radiator (left side) by turning anti-clockwise. Fit drain hose on
connection if necessary.
- If bumper has not been removed from vehicle, pull out retaining clip on
bottom hose going from radiator to engine (right side), and pull hose off
radiator.
Pa
ge 20 of 34 Coolin
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g and installin
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11/21/2002 htt
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19-25

- Start engine and let it idle for about 10
minutes.

- Maintain an engine speed of about 2000 RPM
for about 5 minutes.

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

- Check coolant level and top up if necessary.
When engine is at normal operating temperature
coolant level must be on max. mark, and
between min. and max. marks when engine is
cold.

Note:
When the engine is hot the cooling system is
under pressure. Carefully open filler cap on
expansion tank to release pressure before
starting repair work.

WARNING!

Hot steam can escape from the expansion
tank when the filler cap is opened. Cover the
filler cap with a cloth and remove it carefully.
Pa
ge 27 of 34 Coolin
g system com
ponents, removin
g and installin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE05.19.1

19-27


Vehicles with air conditioner
WARNING!
Do not open the air conditioner refrigerant circuit.
Note:
To prevent damage to the condenser and refrigerant lines and hoses,
ensure that the lines and hoses are not stretched, kinked or bent. - Unbolt pressurizing fan and detach cooling lines for power steering
hydraulic fluid -arrows-.

- Detach air cowls from radiator -4- (left and right).
- Remove securing bolts -1- and -2- for condenser.
- Unplug connector -3- from air conditioner pressure switch -F129.
- Lift condenser up out of its bracket, turn it towards side and secure to
right-hand front wheel with wire.
Pa
ge 29 of 34 Coolin
g system com
ponents, removin
g and installin
g
11/21/2002 htt
p://127.0.0.1:8080/audi/servlet/Dis
play?action=Goto&t
yp
e=re
pair&id=AUDI.B5.GE05.19.1