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Unread 10-07-2009, 12:32 AM   #1
CULate
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Anyone Ever Use K-seal???

I have a small leak in my heater core on my Limited 5.9. So today I decided on the shops advice that does a lot of my work to try K-Seal stop leak. They told me it will not plug up the heater core or radiator as many sealers do. So today I poured it in. I drove it about 10 miles & parked it. I will know more in the morning if it worked. It is made up of ceramic & copper. You just leave it in, & it mixed with all types of anti freeze.
Has anyone else ever used it?

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Unread 10-07-2009, 01:04 AM   #2
sandman
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i havent used it, sounds sketchy though.
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Unread 10-07-2009, 01:09 AM   #3
Mopargearhead
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I don't trust any type of sealer no matter how much they claim it won't cause damage. I had a customer use it to try and seal a leaking water pump on his Dodge Sprinter and it ended up costing him a $600 radiator, new water pump (obviously), and flushing the system multiple times to get the gunk out of the heater core and engine block.
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Unread 10-07-2009, 01:50 AM   #4
dckaz
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Quote:
Originally Posted by Mopargearhead View Post
I don't trust any type of sealer no matter how much they claim it won't cause damage. I had a customer use it to try and seal a leaking water pump on his Dodge Sprinter and it ended up costing him a $600 radiator, new water pump (obviously), and flushing the system multiple times to get the gunk out of the heater core and engine block.
wow not to get off topic but why wouldn't someone just replace a water pump
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Unread 10-07-2009, 12:48 PM   #5
CULate
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Quote:
Originally Posted by Mopargearhead View Post
I don't trust any type of sealer no matter how much they claim it won't cause damage. I had a customer use it to try and seal a leaking water pump on his Dodge Sprinter and it ended up costing him a $600 radiator, new water pump (obviously), and flushing the system multiple times to get the gunk out of the heater core and engine block.
I agree, but I thought I would try it. Heck, a heater core is a BIG JOB. If I can put it off I'll give it a try. The shop that told me to use it has had great success with it. My heater core only leaks when cold once it heats up it stops. As explained to me that Jeep used a plastic with metal core, just like the radiators. & as they get old they seem to seep when cold & when they heat up they stop because of the expansion of metal. I don't have any liquid on the floor or anywhere. Just when you start it in the morning if I don't drive it regularly I smell anti-freeze until it warms up then it quits. Every so often I get a small amount of fog on my windshield.
I'll let you guys know if it does the job.
PS. I know that Alum-Seal & some others will cause all kinds of problems with these newer vehicles. Alum-Seal will as I'm told seal everything including the radiator tubes solid & heater core solid.
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Unread 10-08-2009, 10:54 PM   #6
CULate
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Well, This morning the wife drove the Jeep to work & she said the smell of anti-freeze was gone. So The K-SEAL must of worked. So it seems to be an option to replacing them if they are not too bad.
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Unread 10-08-2009, 11:28 PM   #7
indianajeep
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time will tell - usually those stop leak fixes are temporary at best. But good luck. I speak from experience of buying a ZJ that was full of that stuff - first time the antifreeze was changed - tada - antifreeze leak reappeared - new radiator, new engine, etc. The stop leak was temporarily hiding cracked block, cracked heads and a radiator full of holes.
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Unread 10-09-2009, 11:07 AM   #8
subliminal
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On top of it only being a temp fix your heater core will now not work as effectively since that stuff is coating the inside of it and it will be hindering heat transfer.
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Unread 10-09-2009, 11:12 AM   #9
comishcraig
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Quote:
Originally Posted by indianajeep View Post
The stop leak was temporarily hiding cracked block, cracked heads and a radiator full of holes.
Wow...that's some pretty good stuff if it can stop that much from leaking.
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Unread 10-09-2009, 11:26 AM   #10
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It would be nice if that stuff really worked, it's a band aid on a cut that needs stitches. All that stuff you pour in your radiator has to accumilate somewhere, there are areas you don't want it to accumilate.

Unhook your heater core hoses until you can fix it the right way. Shop around for a good heater core, so you don't have to tear it apart twice.
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Unread 10-09-2009, 03:23 PM   #11
CULate
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Well we will see if & how long it works. The worst case is I will have to take it to the shop that advised using this & does a lot of work for me & have a new heater core installed. It is only $600.
In the old days I use to fix radiator leaks with yellow mustard.
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Unread 12-26-2010, 03:43 PM   #12
Tony01
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The micro particles that k seal use do not gather anywhere, or clog anything, they circulate around the system until there is a leak which causes a small loss in coolant pressure. They are then drawn to the leak blocking and fixing said leak. I have a 95 wrangler 4l limited with k seal in for last 5 years no leaks, no blockages , no problems. If using a sealing product I suggest a cooling system flush first to ensure no blockages before use.
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Unread 11-09-2014, 10:27 PM   #13
new2site
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CUlate...is that stuff still holding up for your heater core??
If it still is 5 years later I'm going to buy stock in it.
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Unread 11-10-2014, 12:59 PM   #14
new2site
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Anyone else use this for a heater core with long term success?
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Unread 11-10-2014, 01:48 PM   #15
Pierre_r
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I have not used K-seal but i have used Bars leaks when my radiator started to leak a few years ago.
It held for about 6 months then i had to replace it.
No issues with it blocking things that other sealers do
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