Never heard of a vacuum bleeder for coolant, whats the issue or why do you need it?
Yes. If it’s the latest gen EA288 engine there is the bleeding test plan on the computer. If there is no improvement like I say I would be looking at the waterpump with the shroud possibly stuck open (they 8/10 times stick closed and cause overheating but they do stick open and cause the cool running issues). There will be no faults stored for the waterpump as it doesn’t have diagnostic capability. Only way to check is remove.Yeah its a diesel. C7 a6 2.0tdi. So it needs plugged in?