smoke/fog coming out of the air vent
Hey guys, lately I notice that once in awhile, and usually it either happen in the early morning or late at night, there are smoke or steam like coming out of my air vents. If I turn on the air or AC, the smoke went away. I searched around, some said it could be just hot and cold air mixed together, causing this steam to come out. There are some said my heater core could be leaking. My coolant does go low, but that happened the past 3 years, and the rate is very slow. Is there a location where I can check if I do have a leak inside the car? It is a 95 Honda Accord.