Inliners International Forums General Discussion Engines overheating issues

Ken,


I have the same radiator type. My setup does not use an expansion/overflow tank. Your may be a later add-on too? All it needs is a dump hose from right below the radiator cap. The "expansion" space is the air pocket trapped inside the radiator when you fill it up. Any excess coolant will be spit out of the overflow tube when the engine gets hot. Once it's purged, no more comes out on subsequent heat cycles and the air space is automatically the right size.
I added an overflow tank on mine just the same. I'm no tree huggin hippy but I don't like running coolant to the ground either.

And like you I didn't like having a pocket in the radiator.