I don’t think the 62s had a radiator overflow tank. But the Jetfire
has a crossflow, so I added one. Keeps it full to the top row of tubes,
and no lost coolant. Actually, all cars should have one; sometimes I
have heard that coolant bubbling out after a pretty hot shutdown, but
later all the fluid goes back in. I put mine where the washer tank was,
with a small copper tube (painted black) crossing over from the cap.
Opening that Jetfire hood on a hot day was like opening an oven, but
the car never overheated. Bruce Roe