Eos (1F7) V6-3.2L (BUB) (2008)
Compressor HVAC: Description and Operation
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, only start engine with system recharged.
NOTE:
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The A/C compressor is continuously driven by the ribbed belt pulley (no A/C clutch):
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If a compressor locks-up, the overload safeguard for the compressor shaft is triggered, this can be recognized by bulges on the ribbed belt
pulley/overload safeguard. If no bulges are visible on ribbed belt pulley/overload safeguard, it may yet be possible that the A/C compressor has
locked-up. Another indicator is abraded rubber material 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 approx. 40 to 50 cu.cm of refrigerant oil remains in the A/C compressor.
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The engine should only be started when the refrigerant circuit is completely and properly installed. 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 the refrigerant circuit discharged:
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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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Engine speed must not exceed 2500 RPM.
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The engine should only run as long as absolutely necessary.
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 instrument panel vents.
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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.