Re: Overheating, tried (almost) everything.
I had a truck years ago that had a cooling issue similar to that. At idle, or low speeds, the truck had no problems, but at highway speeds it overheated quickly. Cooling system was in excellent shape. I noticed one time as I was trying to diagnose things, that I was feeling air being pushed forward instead of being sucked into the engine bay through the radiator. I inspected the fan, and sure enough someone had installed a fan with blades facing the opposite way. Being that there was still air flowing over the radiator, it cooled it just fine until you ran into oncoming air at highway speeds, and with two opposing air forces it just created a dead zone right at the radiator. The correct fan solved the problem.
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