When driving down highway only, it overheats? When running steady, I take it you mean, sitting idling? If it's only overheating at highway speeds, and all else has been checked out & is o.k., I'd take a close look at rad hoses for soft spots (easy to squeeze) that may be causing hoses to collapse at highway speeds & restricting flow of cooling system. Another thing to try is, turn your heater on high fan & high temperature when it starts to heat up & see if temperature gauge goes down (cooler) at all. If it does, then rad not doing it's job properly.
You have to check the coolant level in the radiator when the engine is cool.Best time is morning. Open the radiator cover and put the coolant in and start the engine and wait till the engine is hot and thermostat is open .Then your water level may go down and get vented properly. Please top up again . add water to you reserve tank also up to the mark full .Now try again .Best of luck.If you have problem please come again. Please rate the answer.
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