When I turn my ac on a stinky smell comes from it, and same when I turn it off, eventually it goes away but I dont know what this could be, it's so weird. My honda accord was like this too...

Any suggestions?

 

Well if it smells rotten, you might have a small rodent who was happily sleeping in you ventilation and when you turned it on, the poor little squirrel were blown to bits and now rots in your ventilation system...

If its just bad smell...well your car is probably quite new, so couldn'it just be all the cheicals used in the fabrication process that evaporate slowly and get in the A/C? A new car ooze around 60 000 chemical compounds for the first year (paint, interior finishes, etc.)...

 

I thought you had a 3G TL? You have a 4G or did you post in the wrong section?

 

Check the cabin filter. My friend had a similar smell in his ES 350. He took it in and the filter was changed. Everything was good after that. I hope your issue is this simple.