I am on here because I don’t know anywhere near as much about cars as anyone on this forum. I am looking for help. So far, I have not gotten any indication of what exactly needs to be done. I guess maybe I expected too much.
Here are the cliffnotes
Jack your car up
unclamp the hose going to the heat exchanger
drain fluid, and since you want to flush, you could reconnect the hose, fill with DI water, take the car for a spin, get into boost, then come home and disconnect hose again (will be very hot and pressurized if you dont wait). Fill it with your coolant of choice at the T (which on top of your engine on the passenger side next to the strut tower). Now the fun part, make sure the air is bled out. Im sure you can google how to bleed air out of a radiator. Good luck.