well it a bit wierd dunno, i have said about it before it was doing it quite alot in cold weather making a running water sound on start up, been told head ok, and the car not loosing power i got to use to my old car and it running fine. But it was using abit of water not much but kept topping it up once a month as it was nealry on min, well since it been hot i had my heaters on cold, and it never made that sound and also check my water from about 3 weeks ago and hanst use any extra, so i guessing it must be something to do with my heater matrix now not sure, but as soon as i took my water cap off it made that sound again yet water ok, the oils fine not sure wot it is. The engine 1.2 16v if that helps