About five years ago I replaced my radiator with one built by Atlas and did an extensive write up about it with photos. It was a surprise to me to find a leak under the radiator this week. I wrote to Atlas to get some ideas about the source of the leak considering that it was relatively new. I just received this response:
Sven,
Here's a copy of a recent letter to another person having some minor leak issue ...Good Luck!
Subject: Fwd: "stop leak" ... THERMSEAL from Therm Processes/Dallas TX
Terry: This is what I told you about yesterday... sounds a lot better than the ages-old Bars Leak!
Therm Seal - 1 qt. Jar, Therm Processes, Inc. (https://www.thermprocesses.com/product_info.php?cPath=31_79&products_id=131)
David Bienvenu swears by this stuff. He's a former diesel mechanic, now owns Radiator Service Co/ Houma LA, recent past president of NARSA.
He said a small amount of this finely ground powder has sealed head gasket leaks on big gas engines! How much pressure is that?!
Larry H Frederick
Atlas Radiator Inc
PO Box 331214
Corpus Christi, Texas 78463
361-882-5661, X 1000
361-946-4390 cell
361-882-5699 Fax
Industrial Radiators from Atlas Radiator/Corpus Christi (http://www.AtlasRadiator.CC)
This was not the response I was expecting. Does anyone know about this product?
Have you determined where it is leaking from? Header plate, inlet, outlet etc.
No,
That's not what I would want to hear.
I will help you look for the leak on Sunday.
Amazon.com: MotoRad MT-300 Pressure Tester : Automotive (https://www.amazon.com/Motorad-MT-300-Pressure-Tester/dp/B0067UE6IY/ref=sr_1_42?crid=11MF65IDNE78S&keywords=radiator+pressure+tester+kit&qid=1693628153&sprefix=Radiator+%2Caps%2C225&sr=8-42)
This is similar to my tester
They dont have an adapter for the large cap on our coaches. I just opened the vent valve in the cap and pressurize threw the overflow valve. Just remember to remove whatever you used to hold the cap vent open
Im not a fan of stop leaks , but when I changed my antifreeze mine started leaking and I did ad the Bars and it hasnt leaked yet. Probably will start this weekend since I mentioned it?
Been there done that...
Atlas Radiator dead after 4 years (https://www.foreforums.com/index.php?topic=43788.msg441609#msg441609)
No, it is at the bottom of the radiator (nothing wet above an inch or so) toward the front. I removed the rubber sheet below it and could not find the origin. I also used a mirror to look inside by near the fan - all dry. I'm aware that the fans could also disperse the coolant making it difficult. I was hoping it would be the drain, but it doesn't appear to be the source. Obviously, Atlas is taking no responsibility.
Atlas didn't like how FT was mounting the radiators and attributed the failures to not having a sold shelf. It seems that most have held up 20+ years. In any case, I wish they had advised me of that when I ordered the radiator.
Scott designed a brace for the radiator which I copied and I also hung the trans cooler from
the frame. Good luck findings and repairing the leak.
So in a more abusive environment it is good to support the core between the tanks. Supporting the transmission cooler off the radiator is just wrong. I did build the core support and added additional support for the trans cooler and still plan to build a couple of trans cooler support systems, but have been busy with more pressing projects. Bronco. But still eventually plan to do.
Ref. U320 Radiator oil cooler support (https://www.foreforums.com/index.php?topic=43849.0)