Overheating
If the problem is overheating on the highway, your prrboem is the radiator. Your engine produces more heat as it works under a load. sitting at an idle, it doesn't have to work. It's my opinion that the center rows of the radiator core are stopped up or severely restricted. With it using a plastic and aluminum radiator, I would only go with a new one. Out on the highway, it doesn't need the fans to cool the engine off, the movement of the car forces enough air through the radiator to keep the engine cool. Either that, or check for a badly restricted a/c condensor which will inhibit the air flow to the radiator. My choice would be the radiator.Without seeing it I can only give you my best guess. I work with a lot of Nissan's
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