Practice question

Which fluid should NOT be added to a hot diesel cooling system that has dropped below normal level?

  1. Manufacturer-specified coolant when slowly added with the engine idling
  2. A 50/50 mix of approved coolant and water when the engine has cooled
  3. Cold water directly into a hot, uncovered radiator
  4. Coolant pre-warmed in a kettle for emergencies

Answer: C — Cold water directly into a hot, uncovered radiator

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