I've recently found a massive hole in my coolant reservoir, (I now know what 'the bang' was!). I am looking to buy one a.s.a.p so I can replace it myself and see if that was the problem. I'm thinking there may have been a crack in it previous to this huge hole.
Thanks
It might be worth upgrading to the reservoir with the integral low-level sensor included in the kit you can get from Brown and Gammons, or Rimmer Bros.
That's exactly right yes, thanks Gos!
We're not sure why but we're having a family friend (who also happens to be an old mg/rover mechanic) come to take a look soon so he may find something else.
We're hoping it was just a problem with the tank/cap though!