What if your 2004 Audi a8 temperature sensor is going over 90 degrees to 110 even to 120 but when you turn the heat on the sensor goes back to 90 the mechanic is saying to change the thermostat?

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What if your 2004 Audi a8 temperature sensor is going over 90 degrees to 110 even to 120 but when you turn the heat on the sensor goes back to 90 the mechanic is saying to change the thermostat?