Hey Peeps .

I want to drain my coolant fully,and do a complete flush and coolant change on my 2001 F250 with Powerstroke diesel.

To get the cleanest and most complete draining of the system,I'd like to drain the block,after draining the system at the radiator and hoses.

From the picture provided,can you tell me which of these two drain plugs is for the coolant?



Thanks in advance !

Rick