Audi Q7 2007 Workshop Manual page 171

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Open valve -B- by setting lever in direction of flow.
The suction jet pump generates a partial vacuum in the cool-
ing system.
•
The needle on the gauge should move into the green zone.
–
Also briefly open valve -A- (turn lever in direction of flow)
so that hose on reservoir -VAS 6096/1- can fill with cool-
ant.
–
Close valve -A- again.
–
Leave valve -B- open for another 2 minutes.
•
The suction jet pump will continue generating a vacuum in
the cooling system.
•
The needle on the gauge should remain in the green zone.
–
Close valve -B-.
•
The needle on the gauge should stop in the green zone.
The vacuum level in the cooling system is then sufficient
for subsequent filling.
If the needle does not reach the green zone, repeat the proc-
ess.
If the vacuum level drops, there is a leak in the cooling sys-
tem.
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Detach compressed air hose.
–
Open valve -A-.
The partial vacuum in the cooling system causes the coolant
to be drawn up out of the reservoir -VAS 6096/1-; the cooling
system is then filled.
–
Detach cooling system charge unit -VAS 6096- from ex-
pansion tank.
–
Carefully pull engine cover panel off four retaining pins one
after the other -arrows-.
6-cylinder TDI engine (3.0 ltr. 4-valve common rail), mechanics 01.2006
1 Removing and installing parts of cooling system
Audi Q7 2007 !
6
165