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