Service Manual

Coolant Vent Lines ISB, ISBe and QSB (Common Rail [...]
Page 8-28 Section 8 - Cooling System - Group 08
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Disconnect the coolant vent line from the top of the
expansion tank and the top of the thermostat housing.
Install
Connect the coolant vent line at the top of the expansion
tank and the top of the exhaust manifold.
Connect the coolant vent line for the turbocharger at the
top of the expansion tank.
Connect the coolant vent line to the top of the
turbocharger.
Connect the coolant vent line from the top of the
expansion tank and to the top of the thermostat housing.