My dishwasher was quiet but now when it runs it has a growling noise the whole time.
Answer Hello Scott. Remove the filters from the unit and make sure there is nothing clogged inside the unit. If not, then you will need to replace the circulation pump on the unit.
For the mentioned part how I can test the electrical motor before I install new impeller kit part # 167085 and seal kit part # 171598?
You will want to turn the unit on and let it fill with water. Let the unit cycle until the motor should be on and then check with a voltage indicator at the control board on the wire that goes to the motor to see if there is power. If there is power but the motor is not turning then the motor is bad.