bleed screw/overheating issue
Hi. Just wondering if anyone can shed some light. At the beginning of the week my Brera 2.4JTDM overheated at traffic lights and steam was pouring out. The bleed screw was missing and water/coolant was spurting and spitting out from the top of the pipe. The AA recovery guy came and did a temporary repair with a metal screw so that I could drive to the garage. He reckoned it was unlikely to have happened out of the blue and could have been a result of 'something being tightened too hard' at my last visit to the dealership (a few weeks ago when I had a service and power steering fluid leak repair(?)). The dealership said this was rubbish and that they have to replace the whole pipe, not just a new plastic bleed screw but what I want to know is...could the plastic bleed screw have burst off through overheating or was it the missing bleed screw that made things overheat? I'm confused and face another hefty bill. My car's still at the garage.