64 52 ... Instructions for compressor replacement

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

• Switch on A/C system
• Set all air vents in instrument cluster to "OPEN"
• Start engine and let it stabilize at idle speed
• Set blower output to min. 75 % of max. blower output
• Switch on A/C system and run for at least 2 minutes at idle speed  (risk of damage at higher speed!)

Fig 1: Evacuating Refrigerant Oil From Air-Conditioning System

Courtesy of BMW OF NORTH AMERICA, INC.

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

After evacuation, the refrigerant must be filtered in the service station as the oil separator could still contain a liquid refrigerant/oil mixture. The filtering process gasifies the refrigerant completely and only the previously bound refrigerant oil remains in the oil separator. Measure and note down this quantity of refrigerant oil, refer to Evacuate and fill A/C system, see 64 50 009 Drawing off, evacuating and filling A/C system (R 134a) ..

Fig 2: Transferring Refrigerant Oil Into Container

Courtesy of BMW OF NORTH AMERICA, INC.

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

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

Fig 3: Measuring Amount Of Refrigerant Oil

Courtesy of BMW OF NORTH AMERICA, INC.