07 S550: change coolant w/ vacuum fill tool

[kevm14]

Best tool ever.

https://youtu.be/14xVuOADrNE

Around 80,500 miles. I switched to G48. It may have had the equivalent of the G05 chemistry but the blue G48 is "for Mercedes." In the future I could change it again to make sure it's more pure. Honestly I got most of it out by disconnecting the lower radiator hose. The listed capacity is 8.5L or 2.25 gallons. I got over 2 out for sure so that's pretty cool.

[kevm14]

Preventatively replaced the coolant pressure tank. Easy job. For some reason the new one didn't come with a cap so I had to buy one at dealer retail. The cap is a wear item. Yes I could have used my old cap until I ordered a new one from a cheaper source. But I wanted to complete the task.

I evacuated the tank as much as I could and then sort of did the rest after disconnecting the bottom house. The steam line connections were really cool. They come apart and go together satisfyingly.