Well the heater could be because you have low engine coolant or the thermostat is stuck open so the coolant will not get heated up. As for the AC sounds like you are all out of free-on.
Of course, set the heater/air conditioner temperature control to cold.
You will hear air circulating in the cold air return (or return air grille) when the heater or air conditioner is running.
You are low on coolant to the heater core.
if youre trying to turn the heater on and cold air comes out, then its most likely the heater core
The air conditioner or heater continually runs.
If it is broken. It could be a faulty temperature blend door actuator.
the answer is air conditioner
turn your temp down to 65 it will be cold just let her run
no
If your air conditioner is not blowing cold air and you see ice on the unit, it may be frozen. Turn it off to thaw and check for any blockages or low refrigerant levels.
The max is 90 the minimum you can set it for is 45.
It's obvious that you have problems with wiring. I would start from the heater/AC control panel.