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#4441333 - 06/25/17 05:51 PM Radiator Stop Leak Recommendation
Egg_Head Offline


Registered: 10/07/12
Posts: 284
Loc: North Carolina
My 1979 Jeep CJ-7 w/304 V-8 appears to have a slight coolant leak at the seam towards the bottom, 10 drips on the garage floor after 1 week of not driving. Radiator is the original Blackstone and I believe it is brass. Jeep has 38k original miles and I am driving it to the beach next Friday, trip is about 4 hours. I am willing to roll the bones and try some stop leak, any recommendations? Bars has about 4 different products for this, thanks.
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2009 Cub Cadet LT1042
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#4441342 - 06/25/17 05:57 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
old1 Offline


Registered: 01/04/11
Posts: 1001
Loc: Columbus Nebraska
Although probably most people will say don't use any, just fix it, If you are going to use a stop leak, I would use the Bars leaks pellets or powder, or the pelletized stuff. I think it is all mostly the same ingredient. Just don't use the aluminized stuff. I personally have used all that I mentioned, and found it to work pretty good and cause no problems.
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#4441344 - 06/25/17 05:58 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
andyd Online   content


Registered: 09/25/04
Posts: 7162
Loc: Marshfield , MA
Use the pellets not the aluminum powder
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#4441347 - 06/25/17 06:04 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1407
Loc: Jacksonville, FL
Bars leak pellets or tablets have worked for me on many occasions. I've also had excellent luck with the GM radiator pellets from the parts counter.
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#4441351 - 06/25/17 06:06 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
Superflop Offline


Registered: 07/01/09
Posts: 420
Loc: Seattle
Yeah the gm/ac delco stop leak tablets
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#4441353 - 06/25/17 06:07 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
user52165 Offline


Registered: 10/21/11
Posts: 1332
Loc: CA
Free rental of pressure tester from AZ. Find out exactly where the leak is. A good handyman could solder it if brass. Those band aids you propose do more harm than good. Been there done that.


Edited by user52165 (06/25/17 06:08 PM)

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#4441357 - 06/25/17 06:11 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
3800Series Offline


Registered: 08/02/14
Posts: 1452
Loc: Gulf Coast, MS
K-Seal perhaps? I know some people who has had success with it and it's not one of those types of sealers that just harden at the top of the radiator. I've used there product once when I was going up to Iowa recently. Car hit a deep pot hole out of no where and the water pump was pouring water very quickly.

We where about half way and I tried it since I heard some good stuff about it in the past. Sure enough it solved the problem in about 35-45 mins and the thing stopped leaking and got me to Iowa where I was able to replace the pump and gasket correctly.

I read a lot about it at the time and it's suppose to be mainly a chopper, fiberglass??, and epoxy mix that cure on contact with air instead of just melting when it's hot and gets clogged in the leak over time.

I guess the best thing about it is it can be kept in the system and is safe for the heater core since it only cures after prolonged contact with air and doesn't require the system to be flushed out afterwards.

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#4441372 - 06/25/17 06:29 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
Bud_One Offline


Registered: 04/19/14
Posts: 1832
Loc: Spring,Texas
+1 for the pellets , they've fixed a couple of vehicles of mine in the past that had slight coolant leaks.
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#4441380 - 06/25/17 06:39 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
Donald Offline


Registered: 03/21/04
Posts: 20469
Loc: Upstate NY
A brass radiator can be fixed by a radiator repair shop (if they still exist).
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#4441381 - 06/25/17 06:41 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
901Memphis Offline


Registered: 08/14/10
Posts: 12893
Loc: Northern Kentucky
Yup should be a good candidate for an actual repair
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#4441383 - 06/25/17 06:47 PM Re: Radiator Stop Leak Recommendation [Re: Donald]
Egg_Head Offline


Registered: 10/07/12
Posts: 284
Loc: North Carolina
Getting the OE radiator repaired is my ultimate goal. There is a great family owned, old school radiator repair shop in my town. I'm traveling this week and will not have time to get that taken care of prior to the road trip. I have AAA 100 mile tow service if the stuff hits the fan, part of the adventure.
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1979 Garelli Rally Sport
2009 Cub Cadet LT1042
2002 BMW 540 M Sport (totaled)

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#4441412 - 06/25/17 07:12 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6177
Loc: USA
aluma-seal is good stuff, available as both a liquid and as a powder thumbsup

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#4441433 - 06/25/17 07:47 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
GMBoy Online   content


Registered: 11/22/04
Posts: 7705
Loc: Texas
Great Jeep! I have a similar one but a 1978.

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#4441440 - 06/25/17 07:58 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
Trav Offline


Registered: 11/20/06
Posts: 18904
Loc: MA, Mittelfranken.de
Bars Leak or GM tabs or Subaru sealer only no metallic sealers. The metallic ones will plug an older system up quicker than you can think about it.
The products mentioned use ginger root as the main ingredient, it shrinks when when and only expends wet in the presence of air so it basically just roams around waiting for a leak without doing any damage, OE manufacturers use this formula in some of their problematic engines.

The GM and Subaru ones are available from any dealer, for a V8 GM makes a larger packet and 2 bottles of the Subaru stuff.

https://www.walmart.com/ip/Bar-s-leaks-R...13=&veh=sem

https://www.amazon.com/Genuine-3634621-Cooling-System-Tablet/dp/B000QIH3C4

https://www.amazon.com/Subaru-SOA635071-Coolant-System-Conditioner/dp/B00IGZP2UE
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#4441447 - 06/25/17 08:13 PM Re: Radiator Stop Leak Recommendation [Re: Egg_Head]
Sayjac Offline


Registered: 10/13/08
Posts: 12273
Loc: The Old North State
Edit. Trav's got it covered. Bar's Leak Stop Leak Tabs or ACDelco tabs also my recommendation.



Edited by Sayjac (06/25/17 08:23 PM)
Edit Reason: Change post to reflect a prior reply

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