i have noticed that with my 08 that occasionally when driving after a rain the windshield will fog up on the inside with the defroster on and set at roughly 73 deg. i do not know what i am doing wrong if anything. i also notice that under a/c auto occasionally the window will fog up a little right around the vents, just under normal driving.
In my experience, this will happen if the a/c control is set to recirculate the air. inside the cabin.
Not enough defroster air flow, set ACto low temp initially with high fan, also cracking 1-2 windows open helps. Do not use heat, that will make it worse.
