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Ford Courier overheating

My son?s 2000 Ford Courier 4x4 diesel overheats at speeds over 90 km/h, but if fine at low speed and at idle. It?s had a new thermostat, new water pump, the block and radiator have been flushed, and the fan has been checked. What else could be causing it?

That’s usually caused by insufficient air passing through the radiator core. Check the core to make sure it isn’t clogged with bugs, and make sure there’s nothing in front of the radiator that might be cutting the airflow, such as a bullbar, driving lights, or other gear that guys sometimes mount in front of the grille.

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