Physics · Automobile Engineering

In a 'Wax pellet type' thermostat, what physical process occurs when the engine coolant reaches its designated operating temperature?

Verified Solution4 OptionsUpdated: October 2026👁️1 View

1The return spring compresses due to vacuum, shutting off bypass lines
2The main valve remains strictly closed to raise pressure
3The wax pellet melts and expands, forcing the main valve to open against spring tension✓
4The coolant flow is completely blocked to store heat inside the core

Correct answer

The wax pellet melts and expands, forcing the main valve to open against spring tension

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