Look down the side of the cooler behind the power steering reservoir. Looks like this.

Sensor is normally closed. Open = overheat, so bad connection gives intermittent message on dash.

ESR4329G-03.jpg
 
There is no fan in the instrument cluster or anywhere else for that matter. Relays can emit a hum when they are getting past their best.

There is the little speaker for the traction control and alerts?
 
Look down the side of the cooler behind the power steering reservoir. Looks like this.

Sensor is normally closed. Open = overheat, so bad connection gives intermittent message on dash.

ESR4329G-03.jpg
That's brilliant. Thanks very much!
 

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