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Unread 09-06-2008, 11:24 AM   #1
CO_crawler
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Leaking Heater Core

So, I have had clear water leaking out of my drip line for the heater core for about 9 months. I have always had heat and A/C, and the only problem that I can see is that I am losing coolant fluid levels. When is it time to replace the heater core? Are there problems with doing this with a TJ that has A/C like mine does? Thanks!

I just read that you have to take out the whole dash and drop the steering column....

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Unread 09-06-2008, 11:58 AM   #2
LJameson
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Are you sure it's the heater core? Earlier TJ's have a common problem of leaking the condensation from the A/C into the passenger floorboard. Also, you say the drip line? Are you sure that isn't just the condensation from A/C? If so, thats completely normal. In fact, you want that. Just keep on mind that the A/C runs when it's on the defrost settings too.
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Unread 09-06-2008, 12:18 PM   #3
BringThaPain
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My 97 leaks condensation of the passenger side at times too. A bad heater core will be noticeable, as in you will smell antifreeze coming out of your vents.
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Unread 09-06-2008, 12:29 PM   #4
Sarge37
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If it is the heater core leaking, you can try some good stop leak from any auto store. Make sure to follow instructions and run the heater when you put it in the radiator.
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Unread 09-06-2008, 01:30 PM   #5
UTWeezul
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If it is the heater core, I feel sorry for you. Mine went out and was a pain to get to and replace. You will also need the A/C system evacuated before doing the removal/install.
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Unread 09-06-2008, 01:37 PM   #6
durango-bob
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Since you said that the fluid that was coming out of the hose was clear, I would say that it was just condensed water from the AC system. So your heater core sounds OK to me. As for coolant being lost, do you ever see the overflow bottle dripping any out? Is your exhaust smoke white? Is your radiator cap good and is it tight? Is there any sign of coolant leaking from the radiator where the plastic tanks are connected to the heat exchanger? Is the overflow hose properly attached at both ends? Do you ever see puddles of coolant under the Jeep after it has been driven and parked?
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Unread 09-06-2008, 01:38 PM   #7
CO_crawler
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Uh NO stop leak is the worst thing ever to put into you cooling system. Appears that the heater core is fine but my radiator fluid is brown. Looks like the used car dealer or previous owner used stop leak on this and it is disgusting, will need all new hoses, radiator, etc....the works. I am not taking this one out on the trail next week in crested butte either....that sucks.
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Unread 09-06-2008, 02:20 PM   #8
LJameson
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Quote:
Originally Posted by CO_crawler View Post
Uh NO stop leak is the worst thing ever to put into you cooling system. Appears that the heater core is fine but my radiator fluid is brown. Looks like the used car dealer or previous owner used stop leak on this and it is disgusting, will need all new hoses, radiator, etc....the works. I am not taking this one out on the trail next week in crested butte either....that sucks.
I hear ya with that. I hate stop leak. When my grandpa had our CJ7, he took it to the shop to get a Freeze Plug fixed. Instead of fixing it, they put in leak stop. He wasen't happy with this, but couldn't do anything about it. Then when we pulled the engine out, we realized that the stop leak clogged the coolant passages from the block to the head! Not only that, but it looked like gravy...

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Unread 09-06-2008, 02:45 PM   #9
Sarge37
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Yes I agree about the stop leak, it is a quick fix until you have the time or cash to do a permanant repair. I have replaced an AC Condensor on a 89 Daytona and had to remove the complete dash and console. It was an all day job. I agree that if it is clear water its not the heater core. You will smell it through the heater/AC vents if the core was leaking.
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Unread 09-07-2008, 10:11 PM   #10
CO_crawler
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yeah that pic is exactly what I am talking about. I tried to clean the overflow resevoir and it is like gum, cant get any of it out. That stuff is worthless. Is there anything that will disolve it the next time I flush my cooling system?
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Unread 09-07-2008, 10:29 PM   #11
jprs_peeprs
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Just Say NO! to stop leak...

C.
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Unread 09-21-2008, 01:26 PM   #12
myriad360
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Quote:
Originally Posted by jprs_peeprs View Post
Just Say NO! to stop leak...

C.
x2. Unless you like gumming up your cooling system and replacing all the heater core / radiator parts later because they are so gummed up, they don't cool anymore. This is why I am doing my heater core... somone put that stuff in there, and it no longer recirculates any coolant into the heater core.

You would be way better off just bypassing whatever unit you are trying to stop leak, since that is pretty much what you are doing with it. Worthless gunk.
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Unread 09-21-2008, 07:05 PM   #13
MoJeeper
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It maybe a farmer thing, but we use pepper in our coolant systems if were in a pinch and have a leak..Its work very well.
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Unread 09-21-2008, 10:12 PM   #14
LJameson
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Quote:
Originally Posted by MoJeeper View Post
It maybe a farmer thing, but we use pepper in our coolant systems if were in a pinch and have a leak..Its work very well.
I've heard of something like that, but with cracking an egg in your radiator.
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Unread 09-21-2008, 11:16 PM   #15
Tom Hartz
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Pepper does work, I have done it.

Tom
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