Practice question

What is the primary function of the pressure cap on a vehicle's radiator?

  1. To seal the radiator and raise the boiling point of the coolant
  2. To allow the driver to add water while the engine is hot and running
  3. To filter dirt out of the radiator cooling fluid
  4. To monitor the oil pressure in the engine block

Answer: A — To seal the radiator and raise the boiling point of the coolant

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