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Wait until the thermostat opens , so the top radiator hose is hot , then squeeze the radiator hose and then stop squeezing - if the water pump is working you will feel a surge of coolant through the hose if the impeller inside the water pump is fine ( I'm assuming that there is no squealing sound or coolant leaking from the weep hole of the water pump )

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Q: How can I tell if a water pump is bad on a ford Truck?
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