Overheating

If the thermostat is new then we can assume that it is not the issue for now. The next thing to check is for restrictions and if the fans are turning on. When the engine is starting to get hot the fan should be on high so let's double check this and go from there.

https://www.2carpros.com/articles/engine-overheating-or-running-hot

To check for restrictions we need to use a temp meter around the engine to find out if there are hot spots.

https://www.2carpros.com/articles/how-to-use-an-infrared-temperature-meter

If there is a place that is hotter then the rest of the engine/cooling system them we may have a restriction there.

Let me know about this info and we can go from there. Thanks

Fans do work.

Okay. That is good. So we need to check around the engine for restrictions including the radiator. It should progressively get cooler as you work your way down the radiator. If it is hot and then drops quickly then we may have a restriction there.

Nope, that's good. no problem with the radiator.

Okay. How did you prove out the radiator is okay?

When does this overheat? Idling or do you have to drive?

Also, we need to check around the rest of the engine and cooling system for hot spots. Thanks

It gets hot while driving. what are the other hot spots?

You have to check around the engine with a laser temperature meter for the hot spots. There are no sure bets on that.

As for overheating when driving, that is most likely due to poor air flow like a plugged radiator not allowing air flow through it or a restriction within the cooling system. Like a collapsed hose or restriction inside the passages.

How do you check for a collapsed hose?

The easiest way is to inspect them. If they are literally collapsed or sucked in then that is the easiest way. If they are not, you want to squeeze them as the engine is running and they should feel firm but you should be able to squeeze them and they "bounce" back. Basically if they are soft and don't feel like they returning to their normal size then they are collapsed.