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So on the highway it overheats? not the city? Your fan is fine, the fan is there to bring air through the radiator when your car is moving slower or at a stop. On the highway you already have air flowing through the radiator so the fan shouldn't even be functioning. The problem lies within your radiator.
Do a visual and look to see if there is anything noticeably wrong with your radiator (Plastic bag stuck, trash leaves stuck, damage etc.)
Also look at the fins on the radiator to see if they are damaged or if they look greenish
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