I own a 2000 4.0 180K miles. A few months ago vapor started seeping out of the vents on my dash. Didnt bother me because it was summer and the windows were always open (I replaced the Air conditioner with a bypass pulley), now that it has cooled down, windows up, it clouds my windshield and windows. I have no idea where this is coming from. It isnt exhaust or anything cause it doesnt smell like anything really at all...maybe a hint of antifreeze but not like its burning alot of it. Please help!!

 

You have a leak in your heater core.

 

That looks like a major pain to fix...probably above my skill level? Any suggestions for repair? quick fixes?
Thanks.

 

Stop leak might work for a little while but your best bet is to replace the heater core.

 

you can bypass it for now.

 

This, although in the world outside of your little world, florida, its winter.