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Fan clutch most likely. When you stop the engine, does the fan keep spinning or does it stop quickly? You should hear the roar of the fan when the clutch is locked. It will go away after 3,000 or so RPMs. When my engine gets to 90-95C my fan clutch locks and once the engine is back down to 80-82C it is freewheeling again.
EDIT: Oh, and your main auxiliary fan should kick on at ~105C. It's also really loud and noticeable. Between the aux and engine fans, your engine should be coooool.
Your car should not be getting anywhere close to the red range. That is danger-zone for M103!
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