ok, i bleed the system with the screw. it only took a second for the antifreezeto start coming out of the screw. after that i took the truck for several rides. each time i shut the truck down, antifreeze leaks out from under the cap. i can also hear that boiling sound in the upper radiator hose where it connects to the radiator.


the cap is a tight fit. once the truck cools down, i am going to remove it and try to really tighten it down. im really concerned about the boiling sound. any help is appreciated.

**could the radiator cap be bad?**

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2000 BMW X5 4.4i SPORT