I appreciate that you know a lot more than i will ever know about things mechanical,but 135 degrees seems pretty hot....
For me,doing the 7 second scan

,i mean 30 second or every minute or two,i would rather see a guage creeping upwards,than one suddenly going from fine to cooked.
Anyway,luckily i havent had to worry about an overheating engine,since the day,many years ago,when i drained the coolant out of the GF,now wife's HR,186,then she decided to take it down to the shops to get some milk.About a KM away.Somehow it survived.
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