'94 YJ Sahara (stock).
Thought I would share a problem I found (and fixed) that seemed a little our of the ordinary...but it's a Jeep, so it's probably par for the course!
So, here in the Pacific NW it rains... some.
And as the season grew colder the the last couple of months I started using my heater/defrost to warm up the cabin and defrost the glass.
Well, I noticed on early morning's two things: 1) I could hear a watery 'sloshing' sound inside the cabin whenever I turned a corner, and 2) I would get an ungodly FOG build-up in the cabin! I do mean FOG!
Even though I was putting out heat through the heater to the defrost vents, I literally could not see through any of the glass (windscreen, side windows, and rears).
I first thought that my newly replaced window channel felt might be leaking, but no real water was on the floor pans and could not see a way that might be getting into the defrost vents.
It occurred to me that the fresh air intake on the hood (which is covered by a slotted cover and has a metal screen) might be a source.
I removed the hood air intake cover and screen, and found that this has a 'well' that allows water to collect AND drain, allowing air to flow to the heater fan. In my case, the water was collecting but not draining. Aha!
Under the hood, the water should drain through the firewall into a hollow rubber tube which drips water harmlessly around the transmission housing.
I got under the hood, unclipped the rubber tube and found that this rubber tube was totally filled with junk; years of build-up of stuff that had plugged the drain.
Cleaned it, put it back, and now, no more Fog!!!
Now, i'm just worried that water may have damaged or affected the heater fan components...i guess time will tell?