Porsche 968 - Cooling System Bleeding; Bleeding the Cooling System

Bleeding the Cooling System
If a large quantity of coolant (more than approx .
1
litre (0.88 imp. qts.} must be added, the cool-
ing system must be bled .
Unscrew the bleeder screw (arrow} and pour in
coolant slowly until it escapes from the bleeder
fitting .
Screw in bleeder screw by a few turns. Start
engine and bring to operating temperature at
high idle speed (until radiator fan has cut in and
switched off again}.
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When no more bubbles es t ape from the bleeder
opening, tighten the bleeder screw . Tightening
torque 15 + 3 Nm (1.5 + 0.3 kpm} . Top up
coolant level to "max" mark on expansion tank.
After a test drive, check coolant level and top
up if necessary.