Good Evening Nick,
Welcome from a long time FSI owner.
The FSI is in the minority on here and to be fair a reflection of factory production numbers but comes with a reputation, ......... let's just say not appreciated and yes can need a lot of TLC which can mean expensive but you will develop a thick skin.
In my experience the dash temperature is rock solid 90℃, if it goes above something is wrong, at 95℃ the coolant temperature will be 110+℃ and needs attention. Probably your suspected coolant tank leaking and not allowing correct working pressure. Beyond that next a faulty thermostat, possibly coolant temperature sensor.....
Andy
Welcome from a long time FSI owner.
The FSI is in the minority on here and to be fair a reflection of factory production numbers but comes with a reputation, ......... let's just say not appreciated and yes can need a lot of TLC which can mean expensive but you will develop a thick skin.
In my experience the dash temperature is rock solid 90℃, if it goes above something is wrong, at 95℃ the coolant temperature will be 110+℃ and needs attention. Probably your suspected coolant tank leaking and not allowing correct working pressure. Beyond that next a faulty thermostat, possibly coolant temperature sensor.....
Andy