Hot but Stable - Clutching at Straws

Hey all.
Haven't been able to log on for a few days due to some sort of site problem.
Anyway,I've tried all the above suggestions plus a few more.
Checked the NewVintage temp guage and sensor with another guage and it's reading true.
Soooo.....there's a new aluminium 4 core 22" rad on it's way over.
Will post back results when I've fitted it.