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don't know about the clicks, never heard one, I think you'll have to do more investigation.
as to the heat, while I've not had it apart to verify, I believe there is a door that moves to block off the heater core when the system is set to A/C. It might be the door isn't fully closing.
as to the temp of the air, the system duty cycle varies with what the car thinks the inside temp is vice the setting in the circle to the left of the climate control buttons. So if the setting is around the ambient (outside) temp, then the duty cycle for the A/C is almost zero, all that's happening is a flow through from the vents.
I don't find my fan any noisier than most, it may be your fan motor bearings are going, or something is blocking up the air, making it labor to do it's job.
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