Based, upon the temp monitoring results; technically, those are in the normal range. The code, seems to point to; a possible defective coolant temp sensor?
Review the videos; return coolant, into the tank, would be normal cooling system operation. We have seen cooling systems; that were contaminated, with incorrect mixed green, vw pink g12/13 coolant, which developed into a nasty, thick coagulated mess, that plugged up various hoses and passages.
You might pull the cooling tank return hose; try to blow through it. I had one that was clogged; many have a plastic flow restricter with a tiny coolant passage. In that case, i took a small stiff wire; pushed though the blocked passage, cleared the obstruction, flushed out the hose, blew out with compressed air and confirmed free flow with water. I reinstalled and the coolant flow was restored.
In the case of the contaminated vw Jetta withba 2.0L i worked on; the coagulated junk tended to rise to the higher hoses, passages and coolant tank. I had to remove, a bunch of hoses and use wires, to push out blockages and pipe cleaners to scrub everything out with dawn dishwashing soap and finish off by flushing the whole cooling system, until the water was clear, gunk was mostly gone.
Normally the hoses should have been replaced but the customer was tight on cash and we did the best we could by cleaning and flushing the whole system and it ended up working fine, cooled in normal ranges, didn’t over heat.
However, not being the ideal repair; some residual tiny bits of junk remained floating around, even after 3 flush cycles but didn’t seem to affect cooling system operation.
You may need to remove a bunch of hoses and confirm; free flow from the many areas of the cooling system, clean them out, blow out with compressed air and flush the system throughly, until water runs clearly.
Then, refill the system with coolant and ideally; use a vacuum fill tool and see if things flow, as they should and review the exocvds videos to follow overheating checks, to confirm flow and operation is normal.
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