Funky Noise

The other day I opened the door with the dishwasher running to add a dish, closed the door and then it started making a grinding type noise. It still runs the cycles but the new noise is not normal. I am pretty sure that it is not the grinder. I have tried to locate the noise and it sound that it is coming from the heating vent in the front panel.
Help!

Model Number: KUDIO2IRBL1

Please post your model number.
nat