64 51 525 Removing and installing/replacing expansion valve (N52K)

WARNING: This page is about a different car, the 2013 BMW Z4, 2012 BMW Z4, 2011 BMW Z4, 2010 BMW Z4, and 2009 BMW Z4. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Risk of injury!
Refrigerant circuit is under high pressure!
Follow safety instructions for handling R 134a refrigerant See 6450... INSTRUCTIONS FOR HANDLING REFRIGERANT R 134A or 6450... SAFETY INSTRUCTIONS FOR HANDLING REFRIGERANT R134A .
Avoid contact with refrigerant and refrigerant oil.
Follow safety instructions for handling REFRIGERANT OIL .

IMPORTANT: Risk of damage!
Restart engine only when A/C system has been correctly filled.
Follow INSTRUCTIONS for opening and replacing parts in refrigerant circuit.
If A/C system is opened for more than 24 hours:
Replace DESICCANT INSERT for A/C system.

Necessary preliminary tasks:

DRAIN OFF AIR CONDITIONING SYSTEM

Lever out expansion rivets (1).

Unclip cable holder (2) on tension struts (3) towards top.

Fig 1: Identifying Tension Struts, Cable Holder And Rivets

G06912084

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1) on bulkhead (2).

Pull holder (3) out of rubber.

Fig 2: Identifying Screw On Bulkhead And Holder

G06912046

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Depiction may vary, depending on engine variant.

Release screws (1).

Tightening torque 64 53 2AZ .

Detach refrigerant lines (2) in direction of arrow and press slightly to one side.

Installation:

Replace sealing rings.

Use special tool 00 9 030 Keil to mount sealing rings without damaging them.

Fig 3: Identifying Refrigerant Lines With Mounting Screws

G06912086

Courtesy of BMW OF NORTH AMERICA, INC.

Release screw (1).

Detach adapter plate (2) in direction of arrow.

Installation:

Tightening torque 64 53 3AZ .

Make sure bulkhead grommet (3) is correctly seated in all-round groove of adapter plate (2).

Fig 4: Removing Adapter Plate

G06912087

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Installation:

Tightening torque 64 53 4AZ .

Carefully detach bulkhead grommet (2) from bulkhead and fold down in direction of arrow.

Fig 5: Disconnecting Bulkhead Grommet

G06912088

Courtesy of BMW OF NORTH AMERICA, INC.

Detach expansion valve (1) in direction of arrow.

Installation:

Replace sealing rings.

Use special tool 00 9 030 Keil to mount sealing rings without damaging them.

Unclip frame (2) from bulkhead and insert in groove (3) of bulkhead grommet (4).

Make sure bulkhead grommet (4) is correctly seated.

Fig 6: Removing Expansion Valve

G06912089

Courtesy of BMW OF NORTH AMERICA, INC.

After installation

EVACUATE AND FILL A/C SYSTEM