1992 Chevy Cavalier Coolant leaking

My car is leaking antifreeze from the bottom of the frame on the driver's side right above where the upper radiator hose leads into the radiator. I replaced the hose but it made no difference. I am also seeing water "leak" onto the passenger side when I am running the A/C. My car overheats when I am running the A/C also.

Could it be the lower hose (which is on the passenger side, has what looks like antifreeze dripping down the hose), water pump going bad (car is running just fine, no indication of anything amiss), the head gasket (im not seeing any white smoke from the exhuast), or the actual radiator?

I don't think it would be the heater core because I just had it replaced 3 years ago.