Amongst all the trinkets inside the car behind the steering wheel lies the cabin temperature sensor for the climate-control system. It is not very exciting, but it does serve a useful purpose. This video shows where I found it.

We had been seeing some strange climate-control behaviour: sometimes the coldest setting still produced warm air, 24 degrees felt extremely hot, and on other occasions the air conditioning behaved perfectly. I had also seen an X appear in the corner of the display. At this point I did not know whether the cabin temperature sensor was actually the cause; it was simply one of the inputs worth checking.

We picked up an “Interior Air Temp Temperature Sensor” which appears to be compatible with Holden VT, VX, VY, VZ, WH, WK and WL models. The VY climate control unit consists of these parts as far as I could find: - Evaporator temp sensor, - Condensor temp sensor, - Cabin temp sensor, - Low refrigerant, - High engine temps, - Sun sensor (changes fan ramp and LCD backlighting)

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Sources: Climate Control Changing Temperature Ambient Temperature Sensor Location VY Series II (Calais) Climate Control Problem