Well, it's still overheating, just not as much as before.
Its happy on the M4 / M5 / M7 now at 110, but overheats on some hills.
Climbing fast or slow doesn't seem to make much difference.
For instance, Penrith to Glenbrook, Stanwell Park to Bald Hill. Otford to Helensburg all had it a bit cranky.
Those hills had it just under 3/4 on the temp gauge. As soon as it levels out the temp gauge comes back to 1/2.
Any ideas on what I should be looking at next?