R32 4Motion V6-3.2L (CBRA) (2008)
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Compressor HVAC: Procedures
A/C Compressor
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Only start engine after refrigerant circuit has been assembled.
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After installing a new A/C compressor or fresh refrigerant oil has been filled into compressor (e.g. after blowing through the A/C system), turn
ribbed belt pulley of A/C compressor 10 rotations by hand before starting the engine. This prevents damage to the A/C compressor.
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If possible start engine only with a filled refrigerant circuit.
NOTE:
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The A/C compressor is always driven by the ribbed belt pulley (no A/C clutch):
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If the A/C compressor is blocked, the compressor shaft overload protection is activated. The blockage is mostly recognized by
deformations/bumps on the ribbed belt pulley. In addition, the blockage can be recognized by the abraded rubber in the area of the ribbed
belt pulley.
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The A/C compressor is equipped with a protected oil supply, this prevents A/C compressor damage in the event that the system is empty.
This means that approximately 40 to 50 cu.cm of refrigerant oil remains in the A/C compressor.
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The engine may only be started when the refrigerant circuit is installed correctly. For example; if the refrigerant lines are not connected to
A/C compressor, when the engine is running the A/C compressor may heat up (via internal heat generation) so much that the A/C
compressor will be damaged.
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A/C Compressor Regulator Valve N280 is not activated when the refrigerant circuit is empty and the A/C compressor idles with the engine.
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If it is necessary to start the engine with a discharged refrigerant circuit:
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Refrigerant circuit must be fully assembled.
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At least 1/4 of the prescribed refrigerant oil must be in the A/C compressor.
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No not rev engine higher than 2000 rpm.
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The engine should only run as long as is absolutely necessary, maximum 10 minutes.
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Note the following when starting engine for first time after filling refrigerant circuit:
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Start engine with A/C compressor switched off ("ECON" mode) and wait until the idling speed stabilizes.
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Open an instrument cluster vent.
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Select temperature preset "Lo" on A/C Control Head E87.
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Now switch A/C compressor on ("Auto" mode) and allow engine to run for 5 minutes at idling speed.
