My 83 Westy was stored for the = winter. In april I noticed that the overflow tank appeared empty so I added = some. This past weekend I took it out and headed for North Conway NH. = When I returned home after the 300 mile trip the overflow tank was completely = full and coolant was coming out of the top of it. At the time I was parked = on a slight uphill incline. The temperature gauge was normal and the = engine did not appear to be overheated. Does anyone know what the problem = might be?