A small amount of air will flow out of that vent when the front panel heats up.
Kitchenaid dishwasher vent. As the dishes are drying many dishwashers use a vent to let out the hot steamy air generated during the rinse cycle. Air is not going to flow into that vent. Controls are hidden from view and status lights with an exterior cycle indicator. The vent opens during the drying cycle and the fan blows hot air through the vent opening at the bottom of the dishwasher door.
The most common reason for replacing the vent is if the dishwasher is not drying properly. If the fan fails the control panel goes blank and the dishwasher. Air that normally flowed out of that vent hole on the inside panel of the dishwasher will now be blown down the vent tube along the left side of that front door and back into the dishwasher through the bottom of the door. This video provides step by step instructions for replacing the air vent on whirlpool dishwashers.
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