i was driving home last night and noticed that there was a puff of smoke that came from the vents, as the ac was on....
it stopped then again started for a sec, then stopped.
it didnt smell like anything burning, but made me think ..."what the hell was that!"

 

When there is a great temperature difference in the car vs. the air coming from my A/C, my A/C will smoke (lol). -- Usually, when my A/C was recently charged, and it gets ice cold. At least in my car, this is the opposite effect of a person breathing outside in very cold weather (due to temperature difference).

 

condensation