Well, the smell was very weak, it felt little acrid, not sure if it was like burning wire. This did happen twice when I increased my car's speed to something like 75 mph. I did run A/C at lower sppeds too, the fog did not comeup.

Try running it in recirc.

Also where can I find evaporator drain tube.

Again how can I check for moldy water sitting in the air ducts. I am very curious here as the many time the air give alergy to my eyes.