Thanks yeah I guess it's the piece behind the thermostat pump, that bolts to engine. Replacing the whole thermostat housing assembly, and then I'll move to the pump. He did say he had replaced it not long, the pump, but from experience sometimes things just go bad... But yeah my beautiful Jag will be sitting til I fix her. My daughters not too happy as I'm using her car, but with what I paid, I'm not mad, just frustrated his 'fix' didn't work.