Most likely it is a bad thermostat. The switch on the radiator fan could also have failed.
a fuse or a bad fan motor
water pump
the air conditioner shouldn't have anything to do with it. there could be a problem with your tires or your driving or your kid could be jumping on the seat
check the weep hole on the bottum of the power steering pump.. if it is leaking the pump could be the problem..
bad condenser
you need to check cooling fans with ac on
temperature sensor, fan relay, or fans themselves are bad.
you could be low on antifreeze, could be a plugged radiator, or the radiator could be dirty. I had the same problem with my Dodge Ram and it was a plugged radiator
could be many things, most likely it needs oil, needs coolant, or it could just have a faulty thermostat, simple
It is important to keep the air conditioner clean and know how to remove mold as it can reduce the efficiency of the air conditioner and also cause a foul smell . You should clean the condenser and the indoor unit.
Have you replaced the cam and/or crank sensor?
Could be the water pump is not working properly.