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Sometimes you can hear the antifreeze/coolant flowing back through the hoses from the heater coil when you shut off the car. This usually lasts only a couple of seconds. My truck does it when I run the heat in the winter. When you are running the heat in the winter you are sending antifreeze/coolant through a "heater coil" that disperses the heat from the fluid through coils which a fan blows into your car. Since the system is pressurized when the engine is running, it returns to normal when you shut off the engine sending fluid back to it's normal level.

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17y ago

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