Ok ill try more detail. I was driving along fine. Then i noticed when i put my foot down it would stay at the same speed, so i shifted down a gear and tried again still the same speed. When i did hit the accelerator though i could hear a sort of ticking noise but a rapid ticking noise. So when i pulled over i lifted the bonnet and there was steam coming from the radiator. Took the cap from the header tank and waited. About 20-30 minutes later i put some coolant in the tank( a few times in the last 4 weeks in car lcd info said check coolant level, but then sometimes it didnt when i started the car) after i put the coolant in there was steam from the airlock hole (which i unscrewed) next to the radiator cap. the temperature did go down, and when the recovery vehicle got there i did try and start it to get on the ramp. But it wouldnt start, the recovery guy said there was a weird compression but was not sure what was wrong. Hope that helps?