QUICK BENCH TEST FOR A COOLING THERMOSTAT - Video

CREDITS/VIDEO FROM: @congotradingparts / IG

Inside the thermostat’s brass capsule, a specialized paraffin wax element melts and expands when surrounding coolant reaches operating temperature. As the solid wax transitions to a liquid state, its volumetric expansion creates tremendous hydraulic pressure within the sealed chamber, forcing a central steel pin outward against a heavy calibrated return spring to open the main valve disk and permit coolant flow to the radiator.

Splashing cold water or cooler fluid over the capsule rapidly dissipates thermal energy, causing the liquid wax to contract and solidify within the chamber. As the internal pressure drops, the stored tension in the return spring overcomes the contracting wax, snapping the main valve disk shut against its seat to restrict flow and allow the engine block to regain heat.

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