QUOTE(bricon123 @ Sep 21 2005, 12:27 AM)
I also had the same problem. AC on, very hot day (Waco Texas). Mist/Smoke coming out of vents. Turns out it was a mist (water vapor) and that actual frost had built up inside fan housing, decreasing airflow out the vents to the point of almost complete blockage! I turned on the heat (not fun on a +110F day) and watched the mist pour out! As the mist disapated and decreased, the air flow from the vents increased dramatically. With all that said, it was a onetime event for me. Yours sounds like a repeat. But, like other said, if it dissapates, its water mist, not smoke. If it smells sweet, its antifreeze which is a leaking heater core. Other than that it sounds harmless.
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Mine did the same thing on an especially hot day in Utah, no water, just mist from the vents.... took it to the dealear they were baffled and told me that if it happened again they would pressure test the system...etc. It only happened that one time so it must have been the ice build up.