The most common cause of overheating at higher speeds are most likely air flow restrictions. Normally when the vehicle is traveling at highway speeds the air flow over the radiator is sufficient to cool the coolant to keep the engine cool. However, when the radiator is clogged it will not allow the air through it to cool it down. The other possible cause is due to an actual coolant flow restriction inside the cooling system. This could be due to a radiator restriction or a thermostat not fully opening causing a restriction.
Unfortunately we don't have a manual for this vehicle to provide specific information but here is a guide that talks about these causes in more detail:
https://www.2carpros.com/articles/engine-overheating-or-running-hot
https://www.2carpros.com/articles/symptoms-of-an-overheating-engine
Let us know what questions you have and we can go from there. Thanks
May 9, 2020 at 10:32 AM
