All car cooling systems have at least 10lb pressure, check with your manufacturer on your car's radiator pressure cap or local parts supplier. If pressure is alot more then I would suspect a leaking head gasket.
Easiest test for the obvious leaking head gasket is when the engineis cold / remove the radiator cap and fill right to the top with water and crank / start engine. If you see a mini "guyser" of water come out then head (S) need to come off.
You haven't mentioned whether its actually losing . using water??
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