How to check/clean heater motor?

[Brewski*]

Do I remove it there on the fire wall? what about inside the truck is there anything to check in there? I hear leaves blowing around and every once and a while one blows into the cab from somewhere. Is there a place to put a screen to block these leaves. Where I lived in Colorado there where no trees for miles so it was not an issue, now it is fall in Missouri so I have losta leaves~!