my nissan serena has over heated and blown water everywhere twice evfemn though i have replaced the water pump i think the problem may be the head gasket but im not to sure

dee293, February 2009

Is your radiator fan cutting in? It could be that if it isn't. I had a Peugeot that had your symptoms and it was the thermostatically controlled switch that screws into the radiator. Didn't find out until after I'd replaced the head gasket only to find it was still doing it.
If not that switch then head gasket failure sounds favourite.

Chicks Fan, February 2009