Without seeing or pressure testing the system my most educated guess would be that the intake manifold is leaking.
Radiator or hose but probably water pump
Radiator or hoses. Possible water pump
from your overflow valve
What color fluid?
You have antifreeze leaking from somewhere that is hitting something hot and turning it to steam.When you turn on the AC the fan is pulling it into the vents. Keep track of your engine collant levels and if they are lowering then there is your problem!!
Knowing the YEAR would help answer your question a little better. Check these things : Water pump, INTAKE MANIFOLD GASKET, And there could be a heater hose fitting screewed into the front left corner of the intake that could be leaking. That's you standing in front of the engine looking at it. There is also a Freeze plug that is hidden on the left front side of the timing cover that could be leaking.
AnswerCheck the water pump. If the water pump bearing is worn out there will be a streak of antifreeze leaking from the bottom of the input shaft.Another prime area for coolant leaks is the intake manifold gaskets. The original gaskets fail at the front corners where the intake manifold meets the heads.
I hasd a similar problem with a 1990 Camaro. My carpet was wet from a leaking heater core. Smell the carpet where it is wet. Does it smell like antifreeze or is it the color of antifreeze? If so nyou have a bad or leaking heater core. Good Luck
water pump leaking at seal hard lower radiator hose or loose clamp hardened or punctured bypass hose shrunken timing cover gasket thermostat gasket shrunken
If the fluid is GREEN in color and you mean near the passenger side front tire it sounds like it could be engine coolant ( usually a 50 / 50 mix of antifreeze and distilled water )
Into the engine's radiator at the front of the engine compartment ; see the link below to a video tutorial .
Rear main engine seal or front transmission seals