Installing PCU48

• Position PCU48.
• Connect the coolant line (1) within the vehicle interior and engage.

The detents must be audibly engage.

Courtesy of BMW OF NORTH AMERICA, INC.

• Position the lines (1) (2) and (3) on the PCU48 (4) correctly as per colors and designations.

Courtesy of BMW OF NORTH AMERICA, INC.

• Tighten the screws (3).

• Connect connectors (2) and lock.
• Tighten nuts (1).

Courtesy of BMW OF NORTH AMERICA, INC.

• Clip in the cover (1).

Courtesy of BMW OF NORTH AMERICA, INC.

• Position the cover (2).
• Tighten the screws (1).

Courtesy of BMW OF NORTH AMERICA, INC.

• Check the sealing rings (1) of the coolant lines (2) for damage and replace if necessary.

Courtesy of BMW OF NORTH AMERICA, INC.

• Connect and lock the coolant hose (4).
• Connect and lock the coolant hose (3).
• Position the coolant flange (2).
• Tighten down screw (1).

Courtesy of BMW OF NORTH AMERICA, INC.

• Position coolant line (2).
• Tighten the screws (1).

Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work 

• Install acoustic COVER .
• Install right a-pillar footwell side TRIM PANEL .
• Install front right door sill COVER STRIP
• Install the right footwell TRIM PANEL .
• Reconnect all battery GROUND LEADS .
• FILL AND VENT the low-temperature coolant circuit.
• ACTIVATE the 48 v electrical system.
• Replacement only: ENCODE/PROGRAM control unit(s).