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AC fan output cycles on and off

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I have a separate AC fan which is controlled by an ignition accessory output channel. I have the fan temp set to 110-C so it will only activate when there is an AC request (DI-2). While driving along I see the outputs to the compressor and the AC fan are on and the AC is functioning.  Then the ac fan output will turn off and stay off for awhile (the compressor output is still "ON"). Then occasionally the fan will turn back on. This is very frustrating why is this happening?

Thanks, any help will be appreciated.

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