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  • Where does coolant come out of the radiator?

  • Coolant enters the radiator from the top and flows out the bottom. The thermostat is connected to the lower radiator hose blocking coolant from entering the block until the engine is warmed.

  • How does an engine coolant pump work?

  • A pump , driven by a pulley and belt from the crankshaft , drives hot coolant out of the engine to the radiator , which is a form of heat exchanger . Unwanted heat is passed from the radiator into the air stream, and the cooled liquid then returns to an inlet at the bottom of the block and flows back into the channels again.

  • What happens to the coolant when the engine stops and cools?

  • When the engine warms up, the wax melts, expands and pushes the valve open, allowing coolant to flow through the radiator. When the engine stops and cools, the valve closes again. Water expands when it freezes, and if the water in an engine freezes it can burst the block or radiator.

  • What is coolant flow and why is it important?

  • It circulates the engine and helps to keep it running smoothly. Coolant flow through an engine is crucial for two reasons: It prevents the engine from overheating and protects the engine from freezing.