My ac works find during the day, However, at night when i turn my headlights on the ac blows warm air. Now if i turn them off it blows back cold air, that’s strange, Can anyone tell me what is wrong?

I glanced briefly at the wiring diagrams for the air conditioning system of this vehicle, but cannot find an easy correlation to vehicle lighting and compressor control. It would seem reasonable to think that there is something that is affecting air conditioning control when the backlight of the controls comes on, when the switch comes on. It would be a good first look to check the wiring harness and connector at the back of the ventilation controls to see if there is some kind of pinched wire or short present. Other than that, it's going to take checking to see if the compressor stops running or maybe the temperature control changes. If the compressor stops running, you'll need to check backwards from the compressor in the electrical circuit of the system to see where power stops being present.

What add on accessories have been placed on this vehicle ? IF it didn’t leave the factory with it - post all possibilities.