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Hello, tell me please which fan is cutting on and off in cold mode please... there are two possibilities, the fan on top of the outside unit, and the blower inside the air handler that moves the cool air throughout the home.
Tell me please how frequently it cuts on and off... every 5 seconds or every 5 minutes for instance.
We can go from there
Thanks, ***** ***** the brand and model number of the furnace or air handler that the fan is in.... I have no idea what you have so far... is it that? or a whole house ventilation fan set in a gable or on the roof... there are a few dozen options, each with its own set of probable causes.