Removing and installing/replacing the heating and air conditioning unit (S55 engine)

Special tools required: 

• 00 9 030
• 17 2 050
• 32 1 270

Refrigerant circuit is under high pressure!

Avoid contact with refrigerant and refrigerant oil.

Read and comply with safety information:

• HANDLING REFRIGERANT .
• HANDLING REFRIGERANT OIL .

Attention! 

Risk of damage!

Restart engine only when air conditioning has been correctly filled.

Follow NOTES  for opening and replacing parts in refrigerant circuit.

If Air conditioning is opened for more than 24 h: Replace the AIR CONDITIONING CONDENSER .

Required preliminary work  for the removal and installation  of the heating and air-conditioning unit:

• Drain off AIR CONDITIONING SYSTEM .
• Remove SUPPORT FOR DASHBOARD .

Required preliminary work  for the replacement  of the heating and air-conditioning unit and the subsequent modification of the controller drives:

• Remove RIGHT GLOVE BOX WITH HOUSING .
• Ignition ON
• Use the BMW diagnosis system to move the controller drives into the installation position as follows:
  • Service functions
  • Body
  • Heating and air conditioning functions
  • Flap motors
  • Installation position of flap motors
• Disconnect ALL PLUG CONNECTIONS  from the control unit for the heating and air conditioning system.
• Ignition off
• Disconnect NEGATIVE BATTERY LEAD .
• Drain off AIR CONDITIONING SYSTEM .
• Remove SUPPORT FOR DASHBOARD .

Recycling 

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

Catch and dispose of escaping coolant.

Observe country-specific waste disposal regulations.

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Tightening torque 64 53 1AZ .

Disconnect refrigerant lines (2) and lay to one side.

Installation note: 

Replace sealing rings.

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

Courtesy of BMW OF NORTH AMERICA, INC.

Attention! 

Connections must not be mixed up!

Mark connection sequence of water hoses prior to removal.

Release hose clamps (1) with special tool 17 2 050 and detach coolant hoses (2).

Attention! 

Carefully blow out coolant connections on heat exchanger for heating system to remove remaining coolant.

Seal openings or lines on heat exchanger for heating system with special tool 32 1 270 to avoid escape of media and contamination.

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten plug connection (3) and disconnect.

Unclip the air duct (1) to the right of the heating and air-conditioning unit (2).

Unclip the wiring harness at the marked points.

Feed out heating and air-conditioning unit (2) in direction of arrow.

Attention! 

In the event of incorrect installation, there is a risk of water damage in the passenger compartment! Installation note:

Before installing the heating and air-conditioning unit (2), coat condensate drain (4) with LUBRICANT G14 . Heating and air-conditioning unit (2) must fit exactly on condensate drain (4).

Perform a visual inspection after installing the heating and air-conditioning unit (2).

Replacement: 

• Remount EVAPORATOR .
• Remount HEAT EXCHANGER FOR HEATING SYSTEM .
• Remount EXPANSION VALVE .
• Remount ALL CONTROLLER DRIVES .

After installation: 

• Evacuate and fill AIR CONDITIONING .
• Bleed and fill COOLING SYSTEM .

ATTENTION! 

Filling and bleeding must not be performed in ECO-PRO MODE!