I drive on dirt roads to work in my 07 corolla. I hit a bump and heard a clunk in the passenger side under the dash. Soon as I heard that. dirt blew from the vent and the blower or blower motor started makin a noise. Kinda like if u touch your finger to a plastic fan while it's running. Since then my a/c still blows cold just not as hard. I want to fix it but I need to kno if it's the blower or blower motor going out. Please help