[jmcbrew]

These cars don't have enough crazy things that can go bad... I used to be into (owning and working on) VW TDIs. There were certain years where the engine coolant could wick into the vehicle's wiring harness through the coolant tank level sensor. There were cases where people had their tail light assemblies filled with coolant! The repair was full vehicle wiring harness replacement. Not cheap or easy. Later models had a liquid-cooled EGR system that liked to leak coolant into the exhaust stream. Not enough to belch white smoke, but enough to make you wonder where all your coolant was going.

 

[jmcbrew]

Is the whole vacuum procedure excessive? Why not just run the coolant pump? That's how the bubbles surfaces when you drive, right?

Those pumps pump liquid, not air. It just won’t work.

 

[jmcbrew]

So how does the bubble surface, the Bolt has to be shaken, not sitrred?

Yeah, a giant paint shaker would probably work.

But seriously, that's why the dealerships use a vacuum pump. I work at a brewery, and we have some really expensive pumps that are similar... they'll pump water or beer, but once an air bubble gets to the pump, everything stops.