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Old 12-03-2010, 08:51 PM   #1
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heater core is leaking but still heating

I am new here, have owned an 01 2.5 since wife and I bought it new. No AC, it is manual. I have noticed leak in the heater core that is slowly getting worse. I am still getting plenty of heat, but the defrost is not as good as it should be. Has anyone ever used a radiator repair solution to temp. fix their heater core without clogging it all up?

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Old 12-03-2010, 09:12 PM   #2
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Barr's Leak works sometimes. Other people like the powdered aluminum stop leaks. But you really should just replace it, you will have to do that eventually. Breathing those vapors isn't good for you.

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Old 12-03-2010, 10:48 PM   #3
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Heater Core is a big job to change out unfortunately, lots of other things in the way.

I know they have some pretty good two part stop leak/sealers now, if it is a slight leak you may get by until spring.
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Old 12-03-2010, 10:48 PM   #4
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it will heat fine with a leak...until you lose all your coolant. Replace it. Too cheap and easy to replace than to fool with black pepper or bars leak.
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Old 12-27-2010, 02:28 PM   #5
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So I decided to just bite the bullet and replace the core. This seems to be only 1 part of the problem, though. All was fine for a few weeks, but now there is minimal heat coming into the cab. The blower blows on all settings just fine, but there is no difference in the temp regardless of the heat/ cool setting. any ideas?
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Old 12-27-2010, 02:55 PM   #6
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I'd guess the valve that lets the hot water in that loop is stuck almost closed. Do the hoses feel hot that go to the heater core? If not, see above.
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Old 12-27-2010, 02:58 PM   #7
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Originally Posted by KCrisp View Post
I'd guess the valve that lets the hot water in that loop is stuck almost closed. Do the hoses feel hot that go to the heater core? If not, see above.


There is no valve in the coolant lines to the core.
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Old 12-27-2010, 02:59 PM   #8
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So I decided to just bite the bullet and replace the core. This seems to be only 1 part of the problem, though. All was fine for a few weeks, but now there is minimal heat coming into the cab. The blower blows on all settings just fine, but there is no difference in the temp regardless of the heat/ cool setting. any ideas?
Sounds like the blend door is not moving
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Old 12-29-2010, 06:15 PM   #9
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Neil,

any suggestions on that blend door? I am thinking that I am going to have to tear the dash apart again and go through all that to check it.

My coolant is good and full, the engine warms up nice and good, the top hose is hot, but not burning to the touch as are the hoses to/ from the heater core.

Thanks
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Old 12-29-2010, 07:26 PM   #10
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Sorry I do not. I know I have seen posts either here or jeepforum about blend door issues but did not really read them to know what the problem was. Do a google search of this forum and blend door and of jeepforum and blend door.

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