[Ronin]

This is time its the coolant temperature gauge.

I got in the car today and let it run for 10 mins, and by the time i drove 2 miles temperature was bang on 90c with 22c in sunny Cardiff today.

Few minutes of driving later the gauge droppped back to 0, I stopped to fill up and put some redex in and continuted driving for further 15 mins, with the gauge showing 0.

Once i parked and switched the engine off and back on, the gauge went straight to 110 and slowly started falling back untill it settlend on 90c.

Thermostat was replaced about 500 miles ago along with timing belt etc etc.

Could this be air in the system or a bad temp sensor?