Ok... I wanna flush my coolent but I have a question

reading the manual the intercooler takes a 50/50 mix of normal coolent is this correct ? is it linked direct to the normal coolent resovoir ? as it has its own mini resovoir at the back of the bay ? Im guessing not as the book quotes the engine coolent as 5.75l and the intercooler as 2.5l
If the intercooler is seperate then where do I drain it out from

?
For the radiator what mix should I put back in ??? 50/50 again ?
elp
thanks