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That's a new one on me, maybe you need a new radiator cap....7 to 8 psi.

Dry liners as far as I know. The additives make the coolant more efficient regardless, so why not use them... better heat transfer and reduction of bubbles (microscopic) and better corrosion protection. I got Cootrak (sp) test strips on line, about $6 for 50 strips. The strips that test the...

This picture should help in troubleshooting the cooling system.

I agree with Lee on the antifreeze and using test strips for acidity and freeze point. Image shows my mix.

If you can't drain the block (plugs seized or whatever), repeatedly drain/fill the raditor, run until t-stat opens to mix all coolant. Do it over, 4 or 5 times. This will leave only a small percentage of the original coolant in the system. The last fill-up will be with antifreeze plus additives...

First time I had occasion to remove the radiator, I found 1/2 cup full of coresand and debris in the lower radiator hose. After cleaning it, I installed a coolant filter (see image). Coolant "wears out" even if the truck isn't operated, replace it with fresh every 2 to 3 years and use additives...