Do you hear the motor turning or is it just getting hot? The pumps are pretty simple you can switch out the motor from a place like electricmotorwarehouse.com for cheap money. To test if its the motor you need to spin the shaft. I would get a mallet and give the side of the motor a few whacks. Otherwise you basically unbolt the pump from the motor and turn it by hand. If it is froze up you need a motor. the impeller may have broken off the motor? or you may have just lost suction. hole in the return lines does this. I hope this helps!