The impossible to solve overheating problem

Dubob said

I’m looking at your pictures, it appears everything is lower than the top hose. It even appears the hose to the surge tank is below that upper hose in height. If that’s the case my suspect would be that you have air trapped in the system and it has no way to burp. Again just by looking at pictures.

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The highest point is the surge tank, then the upper rad hose, then the rad, then the engine. So when filling the system I fill through the upper rad hose and then squeeze out any air that gets trapped, it is a bit of a process but all the air gets out of the system so I dont think it is a problem. I bought bleed screws to put somewhere there but they were never needed because that process worked and the set up worked like that without overheating.