Hello,
I did not see the video that was attached,
on the expansion tank there are two hoses on the back side of the tank (see attached pics) those hoses have spring clamps, make sure those clamps are secured and the hoses are free of any rub marks or are split. There is also a sensor in the bottle as well also (pictured below) there should be an o ring type seal behind the threads where the coolant could be coming from.
Let us know what you find
Dustin
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Saturday, January 28th, 2023 AT 7:52 PM