Its not coming on high but its almost to the point where it requires them to. E.g on a EB dash sits on A in traffic today. It was like 30 degrees on the way home tho but A is still too damn high for my liking. I had a play with it before when some light was left and turns out they turn on just after the L for a bit until it drops back. But as you say shouldn't be reaching those temps under normal use. May be the radiator hmmm. Cause thermostat is brand new and tested it before I put it in. So might invest in a new radiator. wouldn't hurt considering summer will be stupid hot by the looks of it.