64 52... Instructions for compressor replacement

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.

Special tools required:

00 9 030

IMPORTANT: Risk of damage!
Remove the compressor without damaging and without the use of force!
Compressors with plastic belt pulleys:

Avoid impacts/knocks to plastic belt pulley (caused by tools, contact with base).
Return faulty compressors in their original packaging only.

IMPORTANT: When starting up a new compressor for the first time, it is absolutely essential to carry out the following breaking-in procedure:

Switch off heating and air conditioning system
Set all air vents in the dashboard to "OPEN"
Start engine and let it stabilize at idle speed
Set blower output to min. 75% of max. blower output
Switch on Air conditioning system and run for at least 2 minutes at idle speed
Risk of damage at increased engine speed!

IMPORTANT: In the event of a mechanical compressor failure and the resulting ingress of chips into the refrigerant circuit, replace the following parts:

Replace desiccant insert. See REPLACING DESICCANT INSERT FOR AIR CONDITIONING SYSTEM or REPLACING DESICCANT INSERT FOR A/C SYSTEM (CAPACITOR REMOVED) .
Line to the capacitor
Refrigerant oil

The new compressor is filled at the factory with refrigerant oil.

The amount of refrigerant fluid in the new compressor corresponds to the amount of refrigerant fluid for the entire refrigerant circuit.

When replacing the compressor it is absolutely essential to adapt the amount of refrigerant fluid in accordance with the instructions below!

The only time it is not necessary to adjust the amount of refrigerant oil is when replacing the entire refrigerant circuit.

When evacuating the air conditioning system, refrigerant oil is also extracted and collected in the oil separator of the A/C service station.

After evacuation, the refrigerant must be filtered in the A/C service station as the oil separator could still contain a liquid refrigerant/oil mixture. The refrigerant completely gasifies through the cleaning operation. Only the prior bound refrigerant oil remains in the oil separator. Measure and note down this quantity of refrigerant oil.

Fig 1: Draining Refrigerant From Automatic Rear Air-Conditioning System

Courtesy of BMW OF NORTH AMERICA, INC.

REFER TO DRAWING OFF HEATING AND AIR CONDITIONING SYSTEM

Transfer the refrigerant oil remaining in the previous compressor via the oil filler plug completely into a measuring cup.

Fig 2: Removing Refrigerant Into Measuring Cup

Courtesy of BMW OF NORTH AMERICA, INC.

Measure the amount of refrigerant oil collected from the previous compressor.

Fig 3: Measuring Amount Of Refrigerant Fluid Collected From Compressor

Courtesy of BMW OF NORTH AMERICA, INC.

Open oil filler plug and pour entire contents of compressor into a clean collecting vessel.

Installation note:

Replace sealing rings.

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

Tightening torque 64 52 2AZ .

Fig 4: Collecting Compressor Contents Into Clean Container

Courtesy of BMW OF NORTH AMERICA, INC.

From the new compressor, pour the same amount of refrigerant oil (as drained from the previous compressor) 10 g extra into a clean measuring cup and pour again into a clean measuring cup and pour again into the new compressor. At least but a total of 50 g .

Remaining refrigerant oil can be poured into A/C service station tank.

REFER TO EVACUATING HEATING AND AIR CONDITIONING SYSTEM

Otherwise the excess refrigerant oil must be disposed of correctly.

On account of its hygroscopic properties, refrigerant oil must not be stored in open containers.

Fig 5: Collecting Refrigerant Oil Into Measuring Container

Courtesy of BMW OF NORTH AMERICA, INC.

The refrigerant oil drawn off from the oil separator of the A/C service station and from the previous compressor must not be reused and must be correctly disposed of.

Observe country-specific waste disposal regulations.

Fig 6: Disposing Refrigerant Fluid

Courtesy of BMW OF NORTH AMERICA, INC.

After installing the new compressor, it is essential before filling the heating and air conditioning system to pour the same amount of the previously drawn off refrigerant oil into the system again,

REFER TO FILLING THE HEATING AND AIR CONDITIONING SYSTEM

Fig 7: Filling Refrigerant Oil Into Air Conditioning System
Courtesy of BMW OF NORTH AMERICA, INC.

Installation note:

If the refrigerant circuit is open for longer than 24 hours:

Replace desiccant insert. See REPLACING DESICCANT INSERT FOR AIR CONDITIONING SYSTEM or REPLACING DESICCANT INSERT FOR A/C SYSTEM (CAPACITOR REMOVED) .