Eramo77

I have a 2017 sierra 1500. 5.3l. I would like to do a full engine coolant flush, any tips? I've seen some videos online, where the petcock was opened and drained. Could I also drain it through one of the radiator hoses? Does anyone know the total amount of coolant needed for a full flush? I will buy concentrate and mix it with distilled water to make a 50/50 mix.