How To Properly Replace Coolant for 579 Peterbilts

Replaced several parts on my engine, shortly thereafter, I noticed coolant loss from the reservoir, but no leaks.
It is leaking into my DPF and DOC filters via the EGR Cooler.
I inadvertently caused damage to the EGR by not placing a vacuum on the cooling system after draining coolant.
This tool is a must have to avoid leaving pockets of air in your system, which super heat up and can damage the EGR cooler.