Changing the engine coolant by using the system's constant flow loop to our advantage. This was a total experiment so if you have any tips/insights feel free to post them in the comments.

Ideally you would remove the thermostat to allow for 100% coolant flow or at the minimum, have the engine at operating temp and running at a high RPM during the flush.

Items in this video:
Zerek G40 Antifreeze: https://amzn.to/44Ntw1O
3/4" ID Clear Tubing: https://amzn.to/4ar9VGb
Vacuum Caps: https://amzn.to/3wKLbL2