If the engine does not overheat sitting still but does overheat when driving then you most likely have a restriction or an air pocket. I would start by using a laser temp meter to find out if you have hot spots around the cooling system. Basically it should be pretty even temp except for the upper and lower hoses of the radiator. They should be different temperature due to the radiator cooling it down.
Once we know where and if there are hot spots we can determine if that is an air pocket or restriction.
Let us know what you find and we can go from there. Thanks
Here is a guide that covers some of this material:
https://www.2carpros.com/articles/symptoms-of-an-overheating-engine
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Saturday, September 12th, 2020 AT 1:15 PM