warning AUDI A4 1999 B5 / 1.G AWM Engine Cooling System Components Workshop Manual
Page 1 of 38
19-1
Cooling system components,
removing and installing
WARNING!
Hot steam can escape when opening the cap
on the expansion tank: Cover the cap with a
cloth and open carefully.
Note:
When the engine is warm the cooling system is
under pressure. If necessary release pressure
before beginning repair work.
Secure all hose connections with the correct
hose clips (same as original equipment):
Parts Catalog
Hose clip pliers VAG 1921 are recommended
when installing spring type clips.
Replace all gaskets and seals.
The arrow markings on the coolant lines and on
the ends of the hoses must be aligned with
each other.
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Page 6 of 38
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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Page 14 of 38
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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Page 30 of 38
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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Page 37 of 38
19-33
Test requirements:
Engine at operating temperature.
WARNING!
Hot steam can escape when opening the cap
on the expansion tank: Cover cap with a cloth
and open carefully.
- Open cover of coolant expansion tank
Testing pressure relief valve in filler cap - Install tester VAG 1274 with adapter VAG 1274/8 onto expansion tank.
- Using hand pump on tester, build up a pressure of approx. 1.0 bar.
- If this pressure is not maintained, locate and repair leaks.
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pair&id=AUDI.B5.GE06.19.1