Hello,
sounds like the crankcase breather is blocked so the crankcase is building pressure which is released by blowing the dipstick out. There should be a rubber pipe coming from the crankcase and routing to the air cleaner or inlet pipework somewhere, try removing this and making sure that it is not blocked with combustion gunge.
As for the radiator, depending upon where the split is and how clean you can get the surface you might be able to fix it with something like Araldite with a cloth reinforcement (bit of an old thin cotton shirt).
Good luck, you have my deepest sympathy. I know the feeling of having a car that appears to be toying with you, I hit one with a spade once. It didn't make it go but I felt much better (temporarily).
Let me just say that I don't advocate the spade treatment as a repair technique.
Keith853
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