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    2008 GMC Truck Envoy 4WD 4.2L SFI DOHC 6cyl

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    See Details

    Fan Clutch

    Fan Clutch Operation:

    A device installed between the water-pump pulley and fan of an engine- driven fan that is sensitive to engine speed and underhood temperature.

    How To Instructions:

    Inspect - Check for obvious problems.
    Test - Give it an in-depth diagnosis.
    Replace - Out with the old, in with the new.

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