Hello all and thanks for reading this.
Daughters GTC has P0128 fault code and A/C off due to high temp with fan running on full speed & temp gauge on dash not moving above 50 degrees.
New thermostat fitted - (old one was passing a little when cold)
Symptoms the same.
Looked at the service manual pages - should I now be looking at replacing another sensor in the radiator?

Many thanks.

Hi

I have a 14-plate 1.6 Astra Auto.

Recently got the "AC Off Due To High Engine Temp" warning, and an OBD II dongle said it was a P0128.  At the same time the temp gauge went to minimum.  Checked under the bonnet and the fan wasn't running even though we watched the coolant temp run up past 90C.

I'm no mechanic, but my local independent garage swapped out the engine temp sensor, topped up the coolant, cleared down the error code, and everything was back to normal.  Indeed after driving