Does anyone know how to bleed the air out of the radiator

 

There's lots of threads on bleeding air out of the cooling system, use the search function and read to your heart's content!

 

On the standard setup, there's a T valve just past the shroud that is used to bleed air. It's a pain in the a$$ to get all the air out.
Seriously, save yourself time and get the Extinct inline mod, it makes bleeding out the air trivial and has a host of other benefits. This mod has been done for a decade. What Extinct has done is source the parts for you in a kit that makes it super easy and cost efficient to do the mod.
The only draw back is if you are in super cold weather the passenger side heater will take a few more minutes to come to temp.
The inline mod and pvc mod should be the first things you do to upgrade the Disco