over heat issue for my zs td

hi all. I was out with my dog yesterday and whilst driving, my car started to over heat but only slightly and it seemed as if the turbo wouldn't kick in then when I pulled over and tuned my engine off I could hear the fan, it was very loud and on top of that it was vibrating almost like a reactor does. (VRRRM VRRRM VRRRM VRRRM) like that. after id walked the dog and came back I got in the car and it was fine for about half hour then the same. My first thought was That it may be blocked somewhere in the exhaust, then I thought maybe the turbo is dying. Any advice on this before I get to work on it. Cheers.....GHOST.....

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