Interior keeps fogging up! Options

[block]

Mornings/afternoons are fine because there's no moisture built up but once it hits teens to single digit temps my windows would fog the hell up. I've cleaned it with so many different solutions that I've run out of ideas. Turning up the heat doesn't help, same with cooling it. It'll keep building up and im getting sick of driving with fog smears and not seeing at night. I have to wipe every 5 minutes or so lol. I do have a 24 inch crack across my windshield but that should affect be wise I've driven cars with cracked windshield and its been fine. Heater core is good since its blowing hot heat....going to change coolant and see if that helps. Anyone have any other ideas or experiences that may help solve the issue? Sorry it may not make any sense because im just rambling things out from my phones. Thanks!

[RobbMeeX]

Welcome to the wonderful world of heater cores!!! You're gonna love it here. I just got done with the pleasure of both spending my Boxing Day in my Celi pulling the dash. Wait, I mean the entire freakin interior. Did I forget to mention the savings??? Yup, reach into your savings and grab $391 ($318 if you're in the biz) and hand it to the dealer so they can get a brand new one. Grab your handy dandy AC recovery machine and remove refrigerant. Then undo your coolant lines.
Remove console, glove box, under craps, then remove steering wheel (disconnect battery), pull dash, remove AC box then heater box, blah blah blah.
To make life easier order the little o-rings the hook the stub pipes to the core.
When you pull the core you'll notice the core had a weep inside where the fins are. Hit me up if you need any pointers.
Oh and don't disconnect the harness behind the center vents. You'll spend a few days wondering why your locks don't work.