I would suggest , unless there is physical damage to the radiator , that the thermostat is done FIRST , and TEST for possible blown head gasket. How many miles on the engine?
RepairPal Certified shops can diagnose and repair your 2003 Honda Pilot. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
We had it checked and was told we need a new thermostat, radiator, & coolant