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Radiator stop leak #5310672 01/02/20 04:03 AM
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monster1 Offline OP
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The heater core of my 04 2500 dodge ram 5.9l cummins is leaking out the catch pan tube in the firewall. I'm capable of pulling the dash and replacing the heater core, but I don't have time to do it. A very mechanical guy I know recommends radiator stop leak to seal it up, but I've heard horror stories about it clogging up engines and having overheat issues. Part of me doesnt want to touch the stuff and part of me thinks those horror stories are from people who thought "more is better" and probably dumped a whole bottle into the cooling system and plugged it up. It's not leaking really bad. Just leaving a small puddle under the truck. Anybody have anything good or bad to say about this stuff?

Thanks

Re: Radiator stop leak [Re: monster1] #5310677 01/02/20 04:42 AM
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Char Baby Online Content
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Yeah, the last time I used that stop leak was many, many years ago and it worked with limited success. But, it doesn't last forever and you will probably need to replace the heater core anyway. It sounds as though you'll be keeping the vehicle for some time so, you may be better off replacing the heater core. If you can live with it leaking til you can replace it properly, then this may be your best bet...IMO!

EDIT:
OR, if you don't necessarily need heat, bypass the heater core all together and put in an elbow(or whatever) between the two hoses(inlet/outlet) and run it that way temporarily.

Last edited by Char Baby; 01/02/20 04:48 AM.

"Retired"
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'80 Firebird FORMULA V8/4bbl-purchased "NEW"
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Re: Radiator stop leak [Re: monster1] #5310681 01/02/20 05:24 AM
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FordCapriDriver Offline
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I have used it with success to stpo a radiator leak but over time it makes a mess of the whole cooling system and builds up a brown gunk everywhere.
I would not use it, address the leak properly.


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Repsol Elite Super 20W-50

Re: Radiator stop leak [Re: monster1] #5310701 01/02/20 06:17 AM
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zzyzzx Offline
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How bad is the leak?

Re: Radiator stop leak [Re: monster1] #5310740 01/02/20 07:18 AM
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Chris142 Offline
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Don't. Stop leak won't work on plastic. The tanks on the heater are likely plastic just like the radiator.


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Re: Radiator stop leak [Re: monster1] #5310784 01/02/20 08:07 AM
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Inspecktor Offline
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Our Buick was in a minor accident resulting in a small crack at a mounting tab on the tank. The Ranger was also leaking from the timing cover. I used ACDelco radiator stop leak, which I believe is vegetable based. Both vehicles have been leak free for 3 years. They both put out very good heat also.


2001 Ranger 3.0 178.000 mi
2006 Dakota 4.7 156,000 mi
1986 GL1200A 74,500 mi
2001 Buick LeSabre Limited 298,000 mi
2001 Subaru Outback 168,000
Re: Radiator stop leak [Re: monster1] #5310811 01/02/20 08:30 AM
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Lapham3 Offline
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The best stuff out seems to be the GM recommended brown tablets that are about 3/4 inch in diameter. The are beet pulp that has been dried and pelletized. They seem to do a good job of slowing/stopping the leak without clogging anything up. My recollection is that they add a couple of these pellets at the factory as well. Three pellets stopped a leak from either the water pump or intake gasket on my '06 3900 engine a month ago.

Re: Radiator stop leak [Re: monster1] #5310833 01/02/20 08:46 AM
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Gebo Offline
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Not about stop leak. What Lapham3 is talking about seems worth checking out.


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Re: Radiator stop leak [Re: monster1] #5310882 01/02/20 09:45 AM
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mattwithcats Offline
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Those tablets are Bar’s Leak Tablets...

https://barsleaks.com/product/radiator-stop-leak-tablets-hdc/

GM relabeled part number 12378255


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Re: Radiator stop leak [Re: Lapham3] #5310925 01/02/20 10:32 AM
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wings&wheels Offline
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Originally Posted by Lapham3
The best stuff out seems to be the GM recommended brown tablets that are about 3/4 inch in diameter. The are beet pulp that has been dried and pelletized. They seem to do a good job of slowing/stopping the leak without clogging anything up. My recollection is that they add a couple of these pellets at the factory as well. Three pellets stopped a leak from either the water pump or intake gasket on my '06 3900 engine a month ago.


+1 The best answer is to address the leak, but short of that, the GM tabs are the only ones I would use.


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Re: Radiator stop leak [Re: mattwithcats] #5310947 01/02/20 10:57 AM
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jhs914 Offline
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Originally Posted by mattwithcats
Those tablets are Bar’s Leak Tablets...

https://barsleaks.com/product/radiator-stop-leak-tablets-hdc/

GM relabeled part number 12378255


This. They work. Used them for years to stop slow leaks.

Re: Radiator stop leak [Re: monster1] #5310981 01/02/20 11:53 AM
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WyrTwister Offline
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I would recommend repairing the problem . Stop Leak would be my last resort .


Wyr
God bless
Re: Radiator stop leak [Re: WyrTwister] #5311049 01/02/20 01:07 PM
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Malo83 Offline
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This my go to for radiator and heater water leaks, have had good luck with this stuff.

71RxXpvtJ5L._SL1000_.jpg
Re: Radiator stop leak [Re: monster1] #5311135 01/02/20 02:10 PM
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monster1 Offline OP
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Thanks for the replies. I've confirmed that the tank is aluminum. The puddle the leak leaves is the size of a coffee cup ring left on a table. It's not really bad, but I don't like puddles in my drive way. I discovered the leak over the summer just before I was towing an 8000lb trailer out of town so I bypassed the core. Winter set in and I wasn't going to drive around without heat so I hooked the hoses back up. I know replacement is the correct way especially since this is my almost forever truck, but if the bars tabs plug the leak, I'm fine with that for now. Btw, with a leaking heater core, is there a change it could split open and overheat the vehicle while towing in hot conditions? That would be my main concern being stranded. Of course I could always carry a bypass hose and extra coolant.

Last edited by monster1; 01/02/20 02:11 PM.
Re: Radiator stop leak [Re: jhs914] #5311144 01/02/20 02:16 PM
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hummdrumm Offline
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https://barsleaks.com/product/radiator-stop-leak-tablets-hdc/

GM relabeled part number 12378255

[/quote]
This. They work. Used them for years to stop slow leaks.[/quote]

I agree barsleaks tablets work for me. I have used them for over 20 years in different vehicles and they stop the leak or slowed it till I got repair. There are limitations as quoted on tablet’s backside,”6.If leak persists, a second application may be necessary. One package treats systems up to 3 gallons. “. Note that second application may be required. No mention of additional applications. It does turn out Dex-cool turns coolant brown but has not caused any harm or decreased effectiveness. Friend had a bad radiator leak with limited success and he plugged heater core. Put in at least 5 successive loads. Blames the company to date and tells everyone what a bad product it is.
They have excellent customer service with email contact and 800 number. I used another product of theirs which did not work successfully and I called. They sent me the tablets quickly, maybe overnight but can’t remember for sure, and at at no charge. Turns out out it was antifreeze related but not any product problem either. Long story there, maybe longer than this.
Think I like them a lot? It takes me a long time to type something Like this. One finger and many mistakes. As others say not an employee and never received money.
Nothing will stop a leaking radiator pierced by a bullet.


Formerly Manicrodder

2007 H3 Hummer-Mobil 1 0w30 AFE-Fram Ultra Oil Filter

2010 Nissan Frontier SE 4X4-QS 5w30 Advanced Durability


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