I have oil on the passenger side in floor and blowing from the vents and fogging the windows. Does anyone know where it’s coming from? I have green dye in the AC system and the oil doesn’t show the dye.

 

Do vapors smell sweet? If so sounds like a heater core leaking. If it were oil , it wouldnt fog the windows. Have you checked your anti-freeze lately? If it's low, and you don't have any external leaks, good bet it's a heater core gone bad.

 

It IS a leaking heater core.