64 52... Instructions for compressor replacement

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.

• 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! 

• Replace desiccant insert. See REPLACING DESICCANT INSERT  or REPLACING DESICCANT INSERT (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.

Fig 1: Drawing Off Air Conditioning System Refrigerant Oil

Courtesy of BMW OF NORTH AMERICA, INC.

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.

• 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: Transferring Remaining Refrigerant Into Measuring Container

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: Taking Out Compressor Contents In 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.

Fig 5: Taking Out Refrigerant Oil From Compressor Into Measuring Container

Courtesy of BMW OF NORTH AMERICA, INC.

• 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.

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: Pouring 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  or REPLACING DESICCANT INSERT (CAPACITOR REMOVED) .