64 11 205 Removing and installing/replacing heating unit (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 .
Follow INSTRUCTIONS FOR WORKING ON COOLING SYSTEM .

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:

Recycling

Coolant emerges when coolant lines are detached. Have a suitable collecting container ready.

Catch and dispose of escaping coolant.

Observe country-specific waste-disposal regulations.

IMPORTANT: Carefully blow through aluminum twin pipe (on heat exchanger) to remove remaining coolant from heater element.

Release screw (1) on bulkhead (2).

Pull holder (3) out of rubber.

Fig 1: Identifying Screw On Bulkhead And Holder

Courtesy of BMW OF NORTH AMERICA, INC.

Release hose clamps (1) and detach coolant hoses (2).

Release screws (3) and detach refrigerant lines (4) in direction of arrow.

Tightening torque 64 53 2AZ .

Installation:

Replace sealing rings.

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

Installation:

Make sure bulkhead grommet is correctly seated.

Fig 2: Disconnecting Refrigerant Lines

Courtesy of BMW OF NORTH AMERICA, INC.

Remove heating unit (1) in direction of arrow.

Installation:

If necessary, replace seal (2) and seals between heater (1) and bulkhead.

Make sure condensate drain grommet (3) is correctly seated in mounting.

Make sure heater (1) is correctly seated in condensate drain grommet (3).

Fig 3: Removing Heating Unit

Courtesy of BMW OF NORTH AMERICA, INC.

After installation

EVACUATE AND FILL A/C SYSTEM .
Vent cooling system and check for water leaks See 1700039 VENTING AND FILLING COOLING SYSTEM WITH VACUUM FILLING UNIT or 1700009 CHECKING COOLING SYSTEM FOR LEAKS (N54, N52K) .