i was out yesterday in the glorious weather, obviously it was rather hot... the temp gauge was sitting comfortably at the 90 point (half way) got stuck behind a stupid old codja doing 30 then guage started creeping up untill the inevitable warning light and beep came on... at which point i pulled over straight away and sat to cool, when checking for any obiviouse damage, noticed rad was cold and the fan had not swiced on!!! but main waterpipe was hot, that leads into top of rad, could this be a bad circulation problem???(water pump) or could it just have been the weather???? car not done it since, but dont want to push it if there is a problem. has this happened to anyone else at all, and should i worrie??? thanks.