changed the radiator on the wife`s zx yesterday, seemed to take alot of water to fill up but eventually did, so took it for a short run to clear air lock`s and seemed all good. checked the level last thing as she was leaving for work eary and again all good, but she rang me a couple of hour`s later and said light was on and filler bottle woz empty. she took it to a garage and was told they`d keep the car and take the pump apart? any suggestion`s?