DJMONK

Ok. Took it for a spin then left it ticking over in the sun. Temp guage went up to three quarters so I turned it off. Guess I've got some work to do.
I've read that it needs 1 Bar in the system. Maybe there's not enough pressure.
Maybe I should bleed the 3 valves again.
Check for flow via the two pipes underneath the rad.
Check the radiator fan, change fuse.
The little hose coming into the expansion tank is clear, I've seen coolant pass through.
Thermostat?
Coolant sensor?
I don't know where to start.

Any thoughts?
Thanks