How to go about Draining the Radiators on 2020 F3S?

I believe you want to take off the radiator hose and not use the drain plug on the radiators. The drains like to break their seal and leak. Most all take off the radiator hoses.

My 2015 had no drain plugs.
I removed the frunk interior and the grille, followed by the undertray, and disconnected the left lower radiator hose to drain the system.
I repeatedly flushed with distilled water, warming the engine until the thermostat opened, until I got clear water out.

To refill, I checked the manual for the proper capacity, added half that amount in Peak Final Charge PRO concentrate, and finished filling with distilled water. This method accounts for any distilled water left in the system after draining.

I did have an air lock after the final fill, and had to drain a couple ounces from the bleed valve at the front right of the cylinder block to resolve it.
It helps to have a way to monitor engine temp, as you can spot the temp getting high before the factory gauge moves. I used my DynoJet PV4 to monitor.

The 2018
RT Service manual says to remove the Right Hand lower radiator hose to drain coolant. That is like the passenger side on a car/truck, Mayube the F3 is different.

Snoking1127 said:

The 2018
RT Service manual says to remove the Right Hand lower radiator hose to drain coolant. That is like the passenger side on a car/truck, Mayube the F3 is different.

Click to expand...

They're teed together, so it really doesn't matter.
The LH hose was a bit easier to disconnect for me.
When the majority is drained, you can jack up the other side to get a bit more out.
The point of flushing with distilled water is that it doesn't matter if there's a bit left, as long as the final mixture is right.