smoke/fog coming out of the vents

[bdeisle]

with air on or not, just started today i try to turn on heat and it fogs up my windows horribly and at night i turn on the dome light and see a fog, or something floating around and no coolant is leaking, so any ideas of what to look for would be great

[s13gonwild]

im just taking a wild guess..ac going out? might need to be refiled?

[bdeisle]

no ac in the car... but i did notice i accidently hit the ac button and i dunno if that pulls in some kind of air through the open ports

[uno]

heather core might be going out.

[DJ_Sunrise]

my friend has that problem on his z32.. turns out both cats are rotted on the bottom.. so the exhaust is coming up through engine bay, trans tunnel, under car... etc.

~Sunrise

[FastBack 240]

I had the same issue with my car. Its the heater core.