OK, so hear it goes.
What it is.........
2002 Volvo Penta 5.7 Gi-A, ser# 4012059922 VP# 3869117, Closed Cooling system.
What it's doing....
Overheating AFTER coming off plane. Can run for hours at 3200 rpm...........slow down and within 30 to 40 seconds temp rises and alarm sounds...