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Here are some hints that the water pump is NOT working properly:

  • No circulation. It is rare for a pump not to work but I have seen water pumps with a plastic impeller break apart when over revved.
  • The engine will either run hotter than normal, or it will overheat altogether. Sometimes, depending on the type of pump failure, there will be coolant seeping from the waterpump's weep hole (if it has one), located directly above and in line with the pump shaft on the pump's casing.
  • Feel your upper and lower radiator hoses. If one is very hot to the touch, and the other is lukewarm or cool, then you most likely have a bad waterpump.
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Q: How can you tell if the car's water pump is working properly?
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