17 11 100 Removing and installing/replacing coolant expansion tank (N20 PHEV)

WARNING: High-voltage system - risk of serious injury or death. Observe SAFETY INFORMATION for working with electric vehicles.

WARNING: Risk of scalding!
Only carry out repair work on the cooling system after the engine has cooled down!

Necessary preliminary tasks:

Necessary preliminary tasks:

FOLLOW instructions for repair work on the cooling system.

Disconnect coolant hoses from coolant expansion tank.

Removal:

Release sealing cap (1).

Draw off coolant with standard pump.

Fig 1: Identifying Coolant Expansion Tank Sealing Cap

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Unlock coolant line (1) and release.

Unfasten screws (2).

Lift the expansion tank (3) slightly until the coolant line and connector are accessible.

Fig 2: Identifying Expansion Tank, Coolant Line And Screws

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Unlock and release connector on coolant level switch (1).

Unlock and detach coolant hose (2).

Collect and dispose of escaping coolant.

Thread out coolant expansion tank (3) and remove.

Fig 3: Identifying Coolant Expansion Tank, Hose And Level Switch

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Installation:

Feed in expansion tank (3) and install.

Attach and lock connector (1).

Connector (1) must engage audibly.

Connect and lock coolant hose (2).

The coolant hose (2) must engage audibly.

Fig 4: Identifying Coolant Expansion Tank, Hose And Level Switch

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Feed the expansion tank (1) into the guide (2).

Tighten screw (3).

Tightening torque 17 10 3AZ .

Connect coolant line (4) and lock.

Coolant line (4) must audibly engage.

Top up coolant up to maximum mark.

Fig 5: Identifying Coolant Expansion Tank, Guide, Screw And Coolant Line

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Close sealing cap (1).

Fig 6: Identifying Coolant Expansion Tank Sealing Cap

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Installation note:

Close sealing cap (1) until arrows align.

Required follow-up work: