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Unread 06-11-2007, 05:35 PM   #1
alaksaboy
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Stop leak for heater core leak??

I must have a small leak in my heater core as steam will come out of the defrost and the floor board under the heater is slightly wet. Anybody have success with the radiator stop leak? Did you use one bottle or two?
Thanks

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Unread 06-11-2007, 05:43 PM   #2
tolcu79
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I have used this stuff on a few separate occasions. If the leak is small enough it will stop it. On the other hand if the leak is as bad as you say it is I know that I would just go ahead and change it out. I know that is not what you want to hear but just my honest opinion. If you decide to use the stop leak type stuff, get the kind that you have to drain the antifreeze and run only water to use, (much better than the regular pour in stuff). I know that most mechanics view this type of fix as temporary.
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Unread 06-11-2007, 05:51 PM   #3
shunt
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Replace the heater core. You'll save yourself frustration.
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Unread 06-11-2007, 05:53 PM   #4
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Change it. You'll have to sooner or later anyway.
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Unread 06-11-2007, 05:54 PM   #5
Rocky529
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It's not hard in a Jeep... change it out as everyone else suggested. One day you are going to have coolant all over the inside of your Jeep and your engine will be overheating.
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Unread 06-11-2007, 06:29 PM   #6
laybackman
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After you use it and IF it stops the leak it will only do that for well who knpows before the leak starts again....usually at the worst possible time you will have to go ahead and replace the heater core.....now what do you do with the plugged radiator?

That stuff should be called radiator stop flow. It was invented for crooked used car dealers to move inventory without spending any large $$$ to do so IMHO.
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Unread 06-11-2007, 06:38 PM   #7
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If you have to use a sealer, use Alumnaseal or Silverseal...try a half a container first, a little goes a long way..DONT use two...you'll rue the day, it's really effective stuff...
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Unread 12-22-2009, 07:42 AM   #8
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So.....I know this is a really old thread, but i have to ask.....what do you do if the previous owner put a few (more than 2) tubes of stop leak in there? ...my buddy is having this problem right now. Thermostat was plugged up, heater core is plugged up...there was even a glob on the back of the radiator cap....WOW..... is there an easy solution to clean all that crap out so that the heater will work again?
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Unread 12-22-2009, 07:52 AM   #9
jbolty
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flush, back flush, flush again. run it for a while with flushing solvent in it then flush it again.

worst case you are looking at a new rad and heater core but make sure the block is all cleaned out first or you will be back in it again.

while you are at it do a compression test. the PO might have been trying to hide a bad head gasket.

good luck.
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Unread 12-22-2009, 08:15 AM   #10
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To answer your question, no I have never had any success with any type of stop leak. Just replace the leaky part like these said. It's the only way to be sure.
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Unread 12-22-2009, 11:37 AM   #11
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Quote:
Originally Posted by Louie4 View Post
To answer your question, no I have never had any success with any type of stop leak. Just replace the leaky part like these said. It's the only way to be sure.
I agree. he stuff is supposed to clog up leaks in a rad or heater core.

If your system is old enough to have leaks spring in it, it is also partially glogged no doubt. Stop leak may not fix the problem but it will add to the 'gloggage' IMHO.


BTW Old timers used to use cinnamon or ground black pepper to 'fix' leaky radiators. I saw (actually smelled) a rad leak that was temporarily repaired (small leak that is) using cinnamon.....smelled pretty good also!
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Unread 12-22-2009, 11:46 AM   #12
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Quote:
Originally Posted by laybackman View Post
BTW Old timers used to use cinnamon or ground black pepper to 'fix' leaky radiators. I saw (actually smelled) a rad leak that was temporarily repaired (small leak that is) using cinnamon.....smelled pretty good also!
I heard of some people putting a raw egg in then running the motor?
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Unread 12-22-2009, 02:06 PM   #13
laybackman
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Quote:
Originally Posted by Louie4 View Post
I heard of some people putting a raw egg in then running the motor?
I have heard of that one also but I would not trust any 'stop leak' goo in my cooling system. And, if it is good enough to plug up a leaky rad or heater core, it might be good enough to plug up a water passage in a head or block or another section of the rad or heater core that is already narrowed out by crud from age.
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Unread 12-22-2009, 03:50 PM   #14
93jeepyj
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My buddy put some alumnaseal in his truck in about november to fix the same issue and it worked for about a week and was leaking again. Last week I helped him change the heater core which was fun, it was an 03 dodge ram and everything had to come out even the steering column had to be dropped. when we got it out the hole was only about the size of a pin... I think id just change it and not run the risk on clogging passages for something thats only a temp fix. You can always bypass the heater core until you have the time to do it.
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Unread 12-23-2009, 07:45 AM   #15
jvetter03
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Quote:
Originally Posted by jbolty View Post
flush, back flush, flush again. run it for a while with flushing solvent in it then flush it again.

worst case you are looking at a new rad and heater core but make sure the block is all cleaned out first or you will be back in it again.

while you are at it do a compression test. the PO might have been trying to hide a bad head gasket.

good luck.
Thanks. I'll go down to the parts store after work and grab another one of those plastic T's so that I can back flush the radiator too...what type of solvent works best?
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