Blower Fan

The blower fan in my 1985 190E is getting noisy. I would like to find out if there is any debris in the housing, if so where is it located and how do I get to it. Could someone send a diagram to show me how to get to it.

the blower fan should be located in the center of the windshield under the hood and under the black cover in the center.
once open you can spray wd40 or similar in the bearing areas and the squeaking should stop.
worked for my car w107