Wes Klemm (47) sent info on making a simple overflow tank: Summer temps in Florida dumps my coolant overboard, causing my prolonged trips to experience a temperature rise.
The tank captures one and a half quarts from expansion. As the engine cools down, the coolant is drawn back into the radiator with no more loss of coolant. Plus, the engine maintains a constant temperature without the need to top off the radiator for the trip home. All materials were purchased at Lowes. The site gauge is made from two plastic barbed hose fittings and clear hose. The tank is white PVC pipe using an end cap and treaded cap fittings for the top. Of course, a stand pipe inside with inlet and overflow fittings at the bottom. Inlet hose is pushed onto the overflow line at the bottom of the radiator. I painted the finished PVC pipe with semigloss black spray paint. Bingo! It looks rugged & looks like it belongs. I didn’t think a store bought chrome, hot rod, overflow tank would match the era.