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Old 11-21-2009, 12:50 PM   #1
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heating problem etc

I have a 99 wrangler sport with some heating issues. I had a problem with a freeze plug and top radiator hose about a month ago . Got those problems taken care of and now have new issues. The heat now works mediocre at best from the defrost and the face settings, but I get cold air at the feet. I did put in Bars stop leak at the time of the repairs I made, and I have heard this may cause clogging. Also, not sure if this is related, but at times after I run the heat it appears that the carpet in the back becomes wet. Not just on the floor but all over. The other morning I had the windows up and noticed condensation inside on the windows. Shed some light on possibilities, please.

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Old 11-21-2009, 01:01 PM   #2
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That condensation & wet floor is most likely from the heater core leaking which is exactly like a small radiator. When it starts leaking, the only fix is to replace it which involves removing the dash assembly. And yes, a stop-leak can clog things and really shouldn't be used except in emergency. The cold air at the feet could be either a mechanical flapper door problem, or perhaps just from the heater core being clogged & not putting out much heat.

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Old 11-21-2009, 01:15 PM   #3
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Typically a leaking heater core leaves a condensation of anti-freeze inside the vehicle doesn't it?...is the condensation on the windows just water or does it leave a greasy film on the windows when you try to wipe it off? Could just be humidity related if it's just water...
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Old 11-21-2009, 03:34 PM   #4
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iv never seen a heater core thats bad leave a "condensation" inside a car but i have seen some real nice puddles under them. if you turn on the heat and you get an oily/sweet smell coming out the vents, the core is bad. you might not notice a puddle or any drops at first but if you can smell it then there is a pin hole and it will only get bigger. iirc the heater core is behind the passenger air bag but you have to take the whole dash out to get to it. its a big job, and a pita, but its not really all that hard.
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Old 11-21-2009, 03:42 PM   #5
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iv never seen a heater core thats bad leave a "condensation" inside a car
My heater core failed on the way home from work off graveyard a couple weeks ago. It was like a mobile sauna. Had to pull over and roll the windows down so I could see.
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Old 11-21-2009, 03:47 PM   #6
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Yeah, my buddy's failed back in highschool in his old Buick Century...that was a fun trip when we noticed it. The windows were fogged up and it was like rubbing motor oil all over them...it just smeared when we tried to wipe em off. We had to drive it home with the windows down.
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Old 11-21-2009, 03:57 PM   #7
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If you end up having to replace your heater core:
TJ Heater Core Replacement - 2

It's also possible that something under there is clogged up like a condensate drain or something and it's dumping water inside the Jeep instead of outside...if it's WATER, it's not your heater core.
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Old 11-22-2009, 01:06 AM   #8
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Quote:
Originally Posted by s3nt3nc3d View Post
Typically a leaking heater core leaves a condensation of anti-freeze inside the vehicle doesn't it?...is the condensation on the windows just water or does it leave a greasy film on the windows when you try to wipe it off? Could just be humidity related if it's just water...


Just water. Definitely not a greasy film.
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Old 11-22-2009, 03:03 AM   #9
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I did put in Bars stop leak at the time of the repairs I made, and I have heard this may cause clogging. Also, not sure if this is related, but at times after I run the heat it appears that the carpet in the back becomes wet. Not just on the floor but all over.

Stop leak bad
Carpet wet but not only on floor but all over

you crack me up
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Old 11-22-2009, 11:40 AM   #10
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I did put in Bars stop leak at the time of the repairs I made, and I have heard this may cause clogging. Also, not sure if this is related, but at times after I run the heat it appears that the carpet in the back becomes wet. Not just on the floor but all over.

Stop leak bad
Carpet wet but not only on floor but all over

you crack me up
Very insightful and helpful, thanks.
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Old 11-22-2009, 02:18 PM   #11
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Okay..based on that if it's just water condensate on the windows and such, you'll need to clear out the drain hose, which is in the engine bay..but I forgot exactly where. I think someone who is far more knowledgeable with TJ's can further explain this part. You say the back (seat area?) is wet everytime you run the heater? Ummm...

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