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2009 2500hd New Fan Clutch not engaging on long hill climbs

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Just put a new GM Clutch in, comes on when you start it up and runs for a while, then goes off so I think it is operating right.  Got overheating the first time I towed since replacing the fan clutch, 87 degree day and pulled a steep hill, overheated to about 230-240 and the fan never cut on.  I guess it could be the cooling stack needs to be cleaned but did that 60k miles ago... must be clogged again... not sure why it is clogging up so often.

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