Hi everyone After a 5 mile journey this morning, I parked up at the local supermarket and when I came back out there was a lovely puddle of coolant under the radiator. I thought it was a blown radiator but when I got it home (only 1/2 a mile away) the puddle is no more, neither is it leaking any more. The header tank looks normal, still has plenty of coolant, but it looks as though the overflow pipe on the header tank had sneezed a load of coolant out. What is likely to have caused this? Am I looking at thermostat, radiator, head gasket, or giving the car a course of Beechams Cold Medicine? It is a 2004 2.2 ICTDI.