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Which fault does a leaking recirculation cooler produce?

  • A.Coolant loss into the intake or exhaust
  • B.Overheating, which follows from the reduced flow of coolant through the exchanger during normal operation
  • C.Nothing
  • D.Loss of coolant into the gas path, which produces white exhaust smoke and a falling level in the expansion tank

Answer: A

An internal leak sends coolant into the gas path and it is burnt. The last option describes exactly the symptoms, which makes it a correct and more diagnostic version of the same answer. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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