so what you're saying is that even if it was overfilled, it would just self-vent (i.e cold to hot fluid pressure build-up which will then overflow through the pressure release valve in the cap)
I'll have a go at bleeding first - I like nipples

I'm going to replace the coolant temp sensor next and go from there I think - sounds like the cheapest option to start with. I can live without A/C (no fan) but cant be doing with overheating when sat in traffic!
