How to Winterize a Whirlpool Dishwasher

Open up the door on the Whirlpool dishwasher.

Pour a quart of RV (Recreational Vehicle) antifreeze into the dishwasher pump. This is located at the lowest point in the floor of the dishwasher. The holes in the bottom of the dishwasher are the drainage holes for the pump. Pour the antifreeze into these holes.

Close the dishwasher door.

Run the pump for your dishwasher. How this is done depends on the model. You only need to run a short cycle, just enough to fill the pump with the antifreeze. On an electronic Whirlpool dishwasher, select the "Rinse" cycle. Listen for the whirring noise of the pump. Press "Off" or "Cancel" when you hear it turn on. On a Whirlpool dishwasher with a manual timer, start the machine on "Rinse" and then slowly turn the timer by hand until you hear the pump start.