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Which device manages that conflict on modern vehicles?

  • A.An electric fan
  • B.A bonnet vent, which allows the heated air to escape upward rather than passing beneath the vehicle floor
  • C.Active grille shutters
  • D.A larger radiator, which allows the same heat to be rejected with a smaller flow of air passing through it

Answer: C

Shutters close the grille aperture when the engine does not need cooling, reducing drag measurably at motorway speed, and open progressively as the demand rises. A bonnet vent to manage the exit flow is a genuine complementary measure used on some designs. Fans address low speed cooling rather than high speed drag.

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