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Kube · 12-07-2025, 02:01 PM

Sealers designed for radiators work best under pressure. Your '40 runs zero pounds so the sealer stays in suspension longer and most will simply settle at the lowest spot in the system.
You may get lucky and it may work. It may.
Me? The '40 Fords often ran on the warm side. I'd not do anything that may make that worse.
I'd pull the heater and have a shop solder the leak.

12-07-2025, 02:01 PM	#3
Kube Super Moderator Join Date: May 2010 Location: Wisconsin, USA Posts: 10,547	Re: Heater core leak Sealers designed for radiators work best under pressure. Your '40 runs zero pounds so the sealer stays in suspension longer and most will simply settle at the lowest spot in the system. You may get lucky and it may work. It may. Me? The '40 Fords often ran on the warm side. I'd not do anything that may make that worse. I'd pull the heater and have a shop solder the leak. __________________ "I can explain it for you. However, I can't understand it for you".