I am going to do this tomorrow now as work has got in the way.
I am going to do the following, if you guys think I need to do things differently let me know.
1. Drain and refill using more coolant.
2. Bleed system with cap off and fans on full.
If that does not cure it I will.
1. Replace temp sender.
2. Check fan wiring.
3. Replace thermostat.
4. Check water pump out.
Dan