Cooling System CirculationAAA Million Auto Parts Inc | aaamillionServing the World with Auto Parts

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Cold Engine (Closed): Keeps coolant inside the engine to warm it up quickly.

Warm Engine (Open): Allows coolant to flow to the radiator to release heat.

Ongoing Regulation: Opens and closes to keep the engine at the right temperature (usually 195–220°F / 90–105°C).

How Coolant Flows

Engine Cold (Thermostat Closed): Coolant stays in the engine so it warms up quickly.
Engine Warm (Thermostat Opens): Coolant flows to the radiator to release excess heat.
Continuous Adjustment: The thermostat opens and closes as needed to keep the temperature steady.

Why This Matters

Prevents overheating and costly repairs.
Improves fuel efficiency.
Keeps heater and A/C working properly.

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