Join Date: Dec 2009
Location: Austin, TX
Ferrari Life Posts: 1,219
Both the temp sensor for the gauge and the temp switch for the fans can fail. I rarely see a bad gauge sensor allow it to read all the way to 200, usually it moves erratically between the temp before the fans kick on, the temp the fans shut off at and it will also drop down to 170ish while moving on the highway.
Before presuming the instrument that measure temp is faulty, check your coolant level and use an IR gun to measure temps and verify if the fans are or are not kick on when they are suppose to be.
It is important to make sure the fans, fan switch, water pump and coolant are all in good order before condemning the gauge.