I've had the water pump quit twice now. First time I went out to investigate and found an inline fuse. Took it out and it was fine. Replaced it and pump fired up. Today, it stopped working, wait...
could be or the impeller or strainer is clogged, causing the pump to strain and overheat. first overheat blew the fuse, second overheat probably tripped a PTC resetable fuse inside the motor.
oh, check voltage at the pump, if it's low, pump might draw more amps, causing it to heat up
strainer should be easy to clean, servicing the impeller, depends on the model.