What is the function of a radiator pressure cap in engine cooling system?

  1. Increase boiling point of water
  2. Reduce boiling point of water
  3. Increase speed of water circulation
  4. Prevent scale formation

Answer (Detailed Solution Below)

Option 1 : Increase boiling point of water
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In normal atmospheric conditions water boils at 100°C. At higher altitude, atmospheric pressure is low and water boils at a temperature below 100°C. To increase the boiling temperature of water the pressure of the cooling system is increased. This is achieved by providing pressure caps to seal the system.

Pressure caps also permits the engine to operate at higher temperatures so that better efficiency of engine is achieved.
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