Check to see if the radiator's top plastic nipple has cracked. If it has then .. it's time for a new radiator. If it hasn't then you need a new clamp. Just use a no-brand clamp. My 300cd's rad leaked from the same spot. Then my mechanic just gave me a new clamp and it hasn't leaked ever since.
2. check the brake calipers just in case one of them is sticking. The clunk could be the front swaybar mounts or the bushings (something like that...)
can you pinpoint where the vibrations are coming from?
2008 BMW 335i Coupe