2003 V35 350Gt Over Heating Issue - Help!

[Mercedesw]

Hey guys,

My v35 has randomly started overheating but it doesn't happen all the time. First time it happened the coolant came bubbling out of the over flow bottle and there were no other leaks or burst hoses. I checked the thermostat and took it out completely to make sure it wasn't that. I then thought it would have to do with the fans but they are working fine. It was fine to drive from 8am - 1pm and then suddenly again started to overheat again with the water bubbling out of the overflow. I've done a complete flush and checked radiator which have all been fine. I'm a bit stumped what to do next! does anyone know?

Thanks heaps!

[scotty nm35]

At a guess, I doubt you bled the air out of the system.