Hey all, So I'm not sure my coolant overflow is working properly. The radiator doesn't seem to be topping itself up from the overflow tank. It works on the way out as the overflow tank gets more in it but then when I open up the radiator it seems to be down a bit on coolant. The overflow tank seems to be in good nick and there aren't any leaks in the coolant system. I have a larger aftermarket aluminium radiator which came with a cap that I'm using if that makes a difference.