Draining the radiator

[svtrit]

I am doing the oil cooler replacement in my 2020 Willys 3.6l.
This was a very easy job on my minivan, but I’ve hit a snag on the Jeep. I turned the petcock to drain the radiator and nothing is coming out. There is no radiator cap to remove, and I’ve removed the overflow cap.
I pulled the top hose off the radiator and still have no flow, though I made a nice mess now.
Anyone else have this issue? How’d you fix it?

Thanks.

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[Blacksport]

Loosen the lower radiator hose, have a big plastic pan ($12 Amazon). Those squeeze clamps are a pain, replace with one of these...the 1.75" size (Amazon)