I would leave things till you're ready to do the belt and tensioner / rollers. The good thing is the thermostat is sticking open intermittently - not closed. So the inconvenience is more a car that's lukewarm through the cold winter months, and possibly a bit thirstier due to non-optimum operating temperature.
Unless you're likely to rack up 15,000 miles before the weather gets warmer, I'd leave well alone. My take on things.
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2006 Audi A8 D3 Quattro Sport 4.2 TDI - Silver, Family Oil Burner.
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