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Which sensor measures cabin temperature without being disturbed by sunlight?

  • A.An aspirated sensor with its own small fan
  • B.A sensor on the fascia, which is exposed to the cabin air and therefore reads the temperature the occupants feel
  • C.No sensor
  • D.An in-car sensor drawing air past it through a small duct, so radiant heat does not corrupt the reading

Answer: A

Drawing air over the sensor prevents sunlight and nearby surfaces from skewing it. The last option describes exactly that arrangement, which makes it a correct and more detailed version of the same answer. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Checking which component actually carries the load settles most questions of this kind at once. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.

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