It's funny that no one mentioned pressure testing your cooling system. I would start with that. If it holds pressure you can rule out a head gasket. I wrecked the front end of mine a lil bit and broke some of the plastic air guides in front of the radiator and noticed mine got a lil hotter from just that. And when all else fails replace with oem parts. I've come to learn that Nissan's are tempermental and really like oem parts.
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