My toyota harrier 2003 3.0 is overheating.

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10/09/2022 10:37 am

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Hello everyone, I'll be honest here, I'm not good with cars mechanically.
I recently restored a Toyota harrier 2003 3.0, the one with the 1mzfe and I'm experiencing an issue where it overheats underload.
I can drive it under 60 km/h (40 mph.) perfectly fine but if i go a bit over, car suddenly starts heating up.
I've gotten it inspected, different mechanics tell me different things.
One states my gasket had leaked, but other mechanics state it's a radiator issue.
I have repaired the radiator, repaired the gasket even and still my car overheats underload, I'm guessing it's an issue with the thermostat