BMW 7 Series: Instructions For Compressor Replacement

Notes

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.

  In the event of mechanical compressor failure and the resulting ingress of chips into the refrigerant circuit, replace desiccant insert for A/C system.

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

• Switch on Air conditioning system
• Set all air vents in instrument panel to "OPEN"
• Start engine and let it stabiles 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!)

When evacuating the air conditioning system, refrigerant fluid 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 cleaning operation gasifies the refrigerant completely and only the previously bound refrigerant fluid remains in the oil separator. Measure and note down this quantity of refrigerant fluid.

Fig. 195: Connecting Special Tools To Evacuating Air Conditioning System

• REFER TO "DRAWING OFF AIR CONDITIONING SYSTEM"

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

Fig. 196: Draining Refrigerant Fluid

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

Fig. 197: Measuring Amount Of Refrigerant Fluid

The new compressor is filled at the factory with refrigerant fluid. Open 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. 198: Pouring Entire Contents Of Compressor Into Clean Collecting Vessel

From the new compressor, pour the same amount of refrigerant fluid (as drained from the previous compressor) + 10 g extra into a clean measuring cup and pour again into the new compressor.

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

• REFER TO "EVACUATING AIR CONDITIONING SYSTEM".

Otherwise the excess refrigerant fluid must be disposed of correctly.

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

Fig. 199: Pouring Amount Of Refrigerant Fluid Into Measuring Cup

The refrigerant fluid 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. 200: [Recycling Refrigerant Fluid]

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

• REFER TO "FILLING AIR CONDITIONING SYSTEM"

Fig. 201: Connecting Special Tools To Evacuating Air Conditioning System

Installation note: If air conditioning system is opened for more than 24 hours:

• Replace desiccant insert for A/C system.

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