My '87 Accord does the same thing. Very annoying and dangerous since your visibility is severely compromised. I cut a small hole in my floorboard carpeting with a boxcutter, stuck my finger in, and to my horror found that the carpet and padding underneath floormat was SOAKED inside. Like I said I had to make a small cut first to figure this out. The problem: I did some research on my vehicle and found out that my car had been registered in Chehalis, WA right before I got it and there was a major flood there about a month before I purchased it. Suddenly it all made sense. The car had been in a flood. The dampness underneath floor covering caused excess moisture on the windows. Like me, you may have a flood car on your hands.. for your sake I hope not but mine does the exact same thing...
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If it were a leaking heater core, the inside glass surface would have an oily film along with the fog.
It sounds like your fresh air intake is not working. You have to get fresh air from the outside to be able to get rid of the excess moisture inside the cabin. Or you have excessive moisture inside from a water leak that the system can't overcome.
Fixing the AC will do the most good. The compressor does not only cool the air, it also drys it. I run the AC with the heat during more humid days in NJ. If you have a low charge you can purchase additional refrigerant with the required hardware at Walmart/Target/any auto store. Also, never leave the AC in the off position while parked. The car is designed to have airflow through the vents when it is not in use.
Your heater core is leaking. Will not defrost because the moisture leaking out of the heatercore is just refogging up your windows. Replace the heater core. Feel your floorboards, espically the passenger side and see if its wet. Check and see if coolent lvl is low. Im 98% sure if you let your engine get to operating temp, and get down in the passenger floorboad and look up under dash, you will see the coolent spraying/leaking out. Sorry to be the bringer of bad news, they are always hard to replace.
Have you been adding a little more antifreeze recently if so check the floor on the pass. side,if it is wet your heater core is leaking.That will also cause the excess moisture on the inside mostly on the winshield.
if it is slippery and stinky, then you have joined the long line of saturn owners with a bad heater core. pay a shop to fix that for you. if it is just wet, then you need to get it up on a lift and have someone stick a long pipe cleaner up into the drain. this would be inside the engine bay, just in front of the passenger footwell. if that does not do it then you have a leaking seal around your window.
pull the rear interior cover from the door and check to see if the latch rod clips are broken or misadjusted. the moisture could be a result of a failed heater core, poor defroster operation (A/C not working, vent door, or blower motor), or the window seal could be defective.