Most automotive heaters use the bottom nipple as the supply because it helps prevent air pockets in the core by pushing the any air bubbles up and out.
I found an old picture when it was being taken apart. So I'll just keep it the same. Thanks for the addition information.
~ John in Utah 1946 1/2Ton w/4-speed manual transmission w/1960 235 engine Here We Go Follow in his DITY Bay
- If you think about it, it has been one year ago today!
