Coolant flush

[Runaround]

I have a 2018 2500 with the Cummins.
I’m about to flush the old coolant out and replace with new and distilled water.
I can’t find a radiator petcock.
Does this truck not have one!
Also how do you go about getting a 50/50 mixture when there is still water in the block? Should I just add three gallons of concentrate and call it good or should I add 2 gallons of concentrate and one gallon of 50/50 and top it off with the distilled water?

 

[06 Dodge]

I have a 2018 2500 with the Cummins.
I’m about to flush the old coolant out and replace with new and distilled water.
I can’t find a radiator petcock.
Does this truck not have one!
Also how do you go about getting a 50/50 mixture when there is still water in the block? Should I just add three gallons of concentrate and call it good or should I add 2 gallons of concentrate and one gallon of 50/50 and top it off with the distilled water?

When I did my 2006 CTD I flushed the cooling system with 8 gallons of distilled water until it ran clean then added 3 gallons of concentrate then top off as needed with distilled water.

 

[Fuel35 67]

Should be on the bottom, lower drivers side. There will be a hex looking plastic **** with a nipple pointing down to the ground. Turn the hex thingy counter clockwise about a quarter turn. Fluid should start coming out.

 

[Runaround]

I found the drain after moving the power steering reservoir a little.