perhaps it is the fan.
it may be rotating, but it is not rotating as fast as it should.
if one drives long enough, the coolant will overheat.
i had problem with my sentra before. the fans were working, but when i compared the volume of air the old ones were pushing, to the amount of air new fans would push, i replaced my "still-working" fans. that solved my overheating problem.
another possibility is clogged radiator tubes.
but i finally got to the fans, after ruling out the other possibilities.
it was a tedious process spanning almost a year.
Last edited by dr. d; December 2nd, 2018 at 01:44 AM.