check your radiator. is it clean or does it need to be replaced? a simple cleaning cured my problem.
most likely the thermostat, but these vans also have a history of blowing head gaskets...... It would help if you described symptoms
check your fan clutch if its weak it will overheat
dose the electric fan run if not check the relay if it runs check the water pump
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Check that the coolant fans are still working, then check out the water pump.
on the Nissan frontiers the thermostat is most likily in the lower radiator hose if you look from under the vehicle you will likily see a round housing with three bolts or nuts just follow the hose up from the rad