64 11 205 Removing and installing/replacing heater (Basis automatic A/C)

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2005 BMW 745i, 2005 BMW 745Li, 2004 BMW 745i, 2004 BMW 745Li, and 2003 BMW 745i. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Avoid contact with refrigerant and refrigerant oil.
Follow safety instructions for handling refrigerant R 134a. Refer to 64 50 ... SAFETY INSTRUCTIONS FOR HANDLING REFRIGERANT R 134A .
Follow safety instructions for handling refrigerant oil. Refer to 64 50 ... SAFETY PRECAUTIONS WHEN HANDLING REFRIGERANT OIL (FOR REFRIGERANT R 134A) .
Follow instructions for working on cooling system. Refer to 17 00 ... INSTRUCTIONS FOR WORKING ON COOLING SYSTEM .

NOTE: The time value given for this work operation does not include drawing off, evacuating and filling the A/C system!

Drain off air conditioner

IMPORTANT: Risk of damage!
Restart engine only when A/C system has been correctly filled.
Comply with notes and instructions on handling optical waveguides. Refer to 61 00... NOTES ON HANDLING OPTICAL FIBERS .

NOTE: If A/C system is opened for more than 24 hours: Replace desiccant insert for A/C system. Refer to 64 53 551 REMOVING AND INSTALLING / REPLACING CONDENSER FOR A / C SYSTEM (N62)

Necessary preliminary tasks:

Disconnect battery negative lead, refer to 61 20 900 DISCONNECTING AND CONNECTING BATTERY NEGATIVE LEAD
If necessary, remove acoustic cover
Remove center of assembly compartment bulkhead, refer to 51 71 085 REMOVING AND INSTALLING CENTER OF ASSEMBLY COMPARTMENT BULKHEAD
Remove fresh air duct on left and right, refer to 64 31 056 REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT FRESH-AIR DUCT (AUTOMATIC A/C HIGH)
Remove trim on instrument panel, refer to 51 45 030 REMOVING AND INSTALLING INSTRUMENT PANEL TRIM

After installation:

Venting cooling system and checking for water leaks, refer to 17 00 009 CHECKING COOLING SYSTEM FOR LEAKS (N62)

Gently pull out locks of quick-release couplings (1) and detach coolant hoses (2).

Fig 1: Detaching Coolant Hoses

G03291028

Courtesy of BMW OF NORTH AMERICA, INC.

IMPORTANT: Carefully blow through aluminum triple pipe to remove remaining coolant from heater element.

Installation:

Vent cooling system and check for leaks.

Release screws (3) and detach refrigerant lines (4).

Installation:

Replace sealing rings.

Tightening torque 64 52 1AZ. Refer to HEATING AND AIR CONDITIONING - TIGHTENING TORQUES .

Release steering spindle lower section, refer to STEERING SPINDLE (LOWER SECTION)

Unscrew nuts (1).

Fig 2: Identifying Grommet

G03291029

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Check that grommet (2) is correctly seated

Disconnect all necessary cable ties on support tube
Release wiring harnesses/cable ducts and lay to one side
If necessary, remove control units/disconnect plug connections

Installation:

Make sure wiring harnesses/cable ducts are correctly secured and laid.

Release retainers and unclip defroster vent (1) at catches.

Fig 3: Releasing Defroster Vent

G03291030

Courtesy of BMW OF NORTH AMERICA, INC.

Carefully lift out defroster vent (1).

Release screws (2).

Installation:

Tightening torque 51 71 12AZ. Refer to BODY EQUIPMENT - TIGHTENING TORQUES - 745I - N62 .

Unscrew nuts (3).

Release screws (1).

Fig 4: Identifying Fuse-Carrier

G03291031

Courtesy of BMW OF NORTH AMERICA, INC.

Lay fuse-carrier (2) to one side.

Unscrew nuts (3).

Fig 5: Detaching Support Tube

G03291032

Courtesy of BMW OF NORTH AMERICA, INC.

Unscrew nuts (1).

Detach support tube (2) and remove from vehicle with assistance of a second person.

Remove soundproofing on left and right from heater
Disconnect plug connections
If necessary, release wiring harness and lay to one side

Installation:

Make sure soundproofing on left and right is correctly seated.

Ensure correct wiring harness routing.

Unscrew nuts (1).

Fig 6: Removing Heater

G03291033

Courtesy of BMW OF NORTH AMERICA, INC.

Remove heater (2) in direction of arrow.

Installation:

Make sure heater (2) is correctly seated.

Installation:

Make sure condensate drain (1) and intermediate piece (2) on left and right are correctly seated.

Fig 7: Identifying Condensate Drain And Intermediate Piece

G03291034

Courtesy of BMW OF NORTH AMERICA, INC.