yet another problem with the xe corsa. the water in the header tank boils and water trys to seep out arount the hose into the engine at the front left. also the the heater doesnt get hot just luk warm.
seems like the thermostsat is stuck and you have an air lock .
renew the thermostsat or break the middle out of it and run it like that and see what happens .best flush the system with a hose (unless thats banned) the radiator might be blocked or somthing ,
also if a head gasket you might get oil in the water or vise versa .