Newfiezj, yeah thast something else I had considered it would be, since there isn't a cabin air filter. Considering it's only happened one other time that I've noticed and that was last winter. I guess my theory was that when I drove the jeep early that morning, the vents were extremely hot, I had the heat cranked to the max. Then I parked it, in the cold obviously, and the temperature change caused condensation to form in be vents.
1995 ZJ Laredo
4.0 I6, 42RE, 3.5" Lift, 31x10.50x15 General Grabber AT2's, Cragar Soft 8's, Westin Safari Bar, Hella Black Magic Lights