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Which actuator directs airflow within the cabin?

  • A.The blower alone, whose speed determines both the quantity and the direction of the air delivered to the cabin
  • B.Nothing
  • C.Stepper or servo motors positioning the temperature blend and the distribution flaps according to the strategy
  • D.Blend and distribution flaps driven by small motors

Answer: D

Small motors position each flap and report their position back to the controller. The last option describes exactly that arrangement, which makes it a correct and more specific version of the same answer. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Framing the question as which quantity the change acts upon makes the answer follow without calculation.

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