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Cooling system access

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Good afternoon,


In the process of my super flush, considering I have many more drains to do, I'd like to know if there's a cap directly on the radiator. So far I have only been able to gain access through the overflow tank. I have an 05 6.0 vortec gas, GMC 2500hd extended cab SLE. Do they not come with drain bolts and caps? I have had to use the lower hose, which hardly gets any coolant out of the system.

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44 minutes ago, txab said:

Lower hose and block plugs is all there is.


I pull the upper radiator hose and flush through that for the block

Where are those block plugs located?

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