Cabin of '94 JY totally fogging up (when running the heater)... -
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Go Back > General Technical Discussions > Cheap Tricks & Fixes > Cabin of '94 JY totally fogging up (when running the heater)...

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Unread 12-16-2012, 06:47 PM   #1
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1994 YJ Wrangler 
Join Date: May 2011
Location: Vancouer, wa
Posts: 3
Cabin of '94 JY totally fogging up (when running the heater)...

Hello All!
'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?


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Unread 12-16-2012, 06:54 PM   #2
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1997 TJ Wrangler 
Join Date: Oct 2012
Location: altoona, pa
Posts: 282
at first i thought you were going to say your heater core was out.
i know a guy with one of them h3's and it has a drip tube around his sun roof , it clogs all the time and leaks in water. and hummer guys HATE water in their rig
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Unread 12-21-2012, 10:03 AM   #3
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2006 LJ Wrangler 
Join Date: Jan 2010
Location: Fredericksburg, Virginia
Posts: 1,449
Originally Posted by tj1997tj
hummer guys HATE water in their rig
Water and mall parking lots don't mix.
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Unread 12-22-2012, 07:58 AM   #4
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Posts: 7
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