First of all, thanks for every reply and reaction. I will process all answers chronologically.
Howard (HH56) & Ernie (Ernie Vitucci), yes, an overflow tank makes perfect sense. The water pipe directly at the thread seam apparently forms an overflow.
Ernie, to find several similar "Coolant Expansion Overflow Tanks" at Speedwaymotors.com was easy, due to the information about
Miss Princess provided in your signature
"1931 Model A Ford Tudor".
Quote:
...It is not under pressure...as it is open to the atmosphere...
I was guided by the inscription on the radiator cap, which btw is still sold today, 80 years later, with this warning. The existence of an overflow seems to prove the correctness of your advice.
image source:
autozone.comAttach file:
radiator cap.jpg (68.97 KB)
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