Originally Posted by 75 racer
I don't know why GM stopped using the petcock in the early 2000'*. It'* been a while since I worked on a north star but I'm pretty sure there is a plug in the block into the coolant passages. I have a wide funnel I use and usually pop the lower hose off and try and catch as much as I can. It is frustrating cause it'* almost impossible not to make a mess.
The problem here I see is the radiator hoses attach 1/2 way up the core on both sides. I heard on another forum that there is a 19mm plug
on the drivers side. I'm still looking for it. Just short of removing the radiator to drain, i'm not sure what to do.