A good trick to check the water pump is to simply take the thermostat out and feel in the water pump cavity. If the impeller is loose or broken in half, it should be easy to feel. Another culprit of the fans not kicking on is the cooling fan control module. It doesn't throw a code when it goes out.The module is located on the driver’s side near the bottom of the radiator. You can also test the fans with a bypass wire.
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