2001 Jeep Wrangler

Hello, I have a problem with my Jeep heater. The engine does blow heat but it also blows a damp air that fogs up the windows. This has just started recently as I did wash the vehicle a day before, the temperature has been consitantly below 0, I was wondering if something has gotten wet or it is a bigger problem, vehicle temperature gauges are normal and coolant level doesnt appear to have changed.

thank you