yeh radiator cap could be the problem, even hairline fractures can cause the cap to not function properly.
You said you bled the system which suggests there shouldnt be any trapped air.
could be a blown head gasket.
to test this take your radiator cap off start the engine and watch for bubbles.
dont be fooled by a few bubbles here and there. if the gasket is blown the bubbles will constantly keep coming.
ohh forgot to mention - another way of checking if gasket is blown is to check your dipstick, it will have a milky coloured look to it.
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