64 52... Instructions For Compressor Replacement

WARNING: This page is about a different car, the 2010 BMW 135i, 2009 BMW 135i, and 2008 BMW 135i. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: 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 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!)

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 DRAWING OFF, EVACUATING AND FILLING A/C SYSTEM (R134A) .

Fig 1: Measuring Quantity Of Refrigerant Oil Using 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.

Fig 2: 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 Oil Collected

Courtesy of BMW OF NORTH AMERICA, INC.

The new compressor is filled at the factory with refrigerant oil. Open filler plug and pour entire contents of compressor into a clean container.

Installation:

Replace sealing ring and moisten with refrigerant oil.

Observe tightening torque: 30±1 Nm

Fig 4: Opening Filler Plug & Pour Entire Contents Of Compressor 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 container and pour again into the new compressor.

Remaining refrigerant oil can be poured into service station tank, refer to DRAWING OFF, EVACUATING AND FILLING A/C SYSTEM (R134A) .

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: Measuring Container

Courtesy of BMW OF NORTH AMERICA, INC.

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

Fig 6: Identifying Refrigerant Oil Drawn Off From Oil Separator Of Service Station

Courtesy of BMW OF NORTH AMERICA, INC.

After installing the new compressor, it is essential before filling the A/C system to pour the same amount of the previously drawn off refrigerant oil into the system again, refer to DRAWING OFF, EVACUATING AND FILLING A/C SYSTEM (R134A) .

Fig 7: Filling Refrigerant Oil Into System

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

If A/C system is opened for more than 24 hours: Replace DESICCANT INSERT .