Pressure testing radiator, air comes out overflow?

I have a 1998 ford ranger 3.0 litre. I have a engine over heat issue and when I try to pressure test the radiator air bubbles are coming through the overflow resevior for coolant. Am I doing something wrong? Should the radiator hold pressure ( I just replaced it)?

Your pressure tester has a bad gasket and is leaking air into the radiator neck and coming out the over flow bottle.

Possibly a blown head gasket.

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