64 52 ... Instructions For Compressor Replacement
64 52 ... Instructions For Compressor Replacement
Special tools required:
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.
In the event of mechanical compressor failure and the resulting ingress of chips into the refrigerant circuit, replace desiccant insert.
When starting up a new compressor for the first time, it is absolutely essential to carry out the following breaking-in procedure:
- Heating and air conditioning system off
- Set all air vents in instrument panel to "OPEN"
- Start engine and let it stabilize at idle speed
- Set blower output to min. 75% of max. blower output
- Switch on heating and 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.
- Refer to Drawing off heating and air conditioning system
Transfer the refrigerant fluid remaining in the previous compressor via the oil filler plug completely into a measuring cup.
Measure the amount of refrigerant fluid collected from the previous compressor.
The new compressor is filled at the factory with refrigerant fluid. 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. 00 00 Excerpt From Company Standard BMW GS 90003-2
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 heating and 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.
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.
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 fluid into the system again,
- Refer to Filling the heating and air conditioning system
Installation note:
If the refrigerant circuit is open for longer than 24 hours:
- Replace desiccant insert
