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Good God. This is "more than you could ever stand to know" about radiator caps. I got a stock-looking cap from Nick that doesn't say Made in Mexico on it. Then, a dime-store recovery tank at the Auto Zone where everything is made in China. Then fill to TWO INCHES from the top with new green coolant. 180 stat. Never had a problem. Does not piss/purge

Take off the cap when cold and I bet ya the radiator is full now. Note: fill radiator to top if using china or mopar recovery system (with the proper cap)and do not fill it to the top if you not using a recovery tank. Its that simple.