RX330inFL

"Smoke, Mist or Fog will come out of your A/C vents on hot, humid days. The reason for this normal phenomenom is the cold, dry air coming from your A/C vents is lower than the dewpoint of the interior cabin. Basically what this means is that cold, dry air is mixing with hot, humid air and causing the smoke. This is similiar to when you open your freezer door and see the fog coming from the freezer. This is a normal condition and will eventually dissipate once the temperatures in the interior cabin and the A/C vents start to balance out. One way to quickly balance the temperature out is to keep the A/C system on recirculated intake air."

From: http://wiki.answers.com/Q/Why_does_a...ir_conditioner

tonyleeusa

Took the RX330 to the shop. It turned out the charge was low. The mechanist said the system had air and the freon was low. There was no leak. It is just the way the AC system works after 8 years. He removed the freon and refilled with fresh freon. Problem solved. If your AC system is putting out white fog from the vent, have the system checked. Fog is a symptom of low charge. If you waited too long to fix it, the system may run out of lubrication and it could cost you more to fix.

Carver

Thanks for posting the resolution!

lexus114

Maybe its a 134 thing or something. Like I mentioned before when mine did this in Louisiana, it was cold as ice air coming out of the vents. Of course that was the good ole r12 stuff in those days.