My patrol overheated towing the boat , so much that engine stopped. The thermostat seemed to be stuck so replaced that.
Same issue with overheating now.
Complete engine replacement about 100k ago.
The original radiator still in the Patrol.
All I can see is either the system really needs flushing, or the radiator is internally corroded. No sign of damage outside.
Boost is set back to factory, intercooler is original.
Only engine mod. is a HPD air flow fitting.

Any good ideas?? Flush the system, replace the radiator, replace the thermostat (again)after checking opening temperature???