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The temp dropping from 90 down to zero and back up again sounds like a dodgy temperature sensor on the engine. I've had that myself.

With the leak I'd put some cardboard under your car when you park up and see if you get any drips. Could be your radiator as they tend to rust at the bottom corners. Have you got any mayonnaise or slug under your oil filler cap? If so could be a headgasket.
 
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