Inspection of a blower motor covers two major parts, is the blower wheel clean and the air holes on the motor itself clean so the motor can cool itself.

the blower wheel needs to be cleaned so that the furnace can move enough air to boil off the freon back to a gas, if the blower wheel it dirty the air flow will be reduced causing a reduction in air flow causing the evaporator to freeze up which could damage the compressor by bot boiling off the liquid freon to a gas and physics tells us we can not compress a liquid. It is very important that the blower wheel itself is clean so it can move as much air as it was designed to. (It is like trying to swim with out your hands cupped you will never move and water to stay afloat.) To clean the blower wheel out is very simple pull the blower tray out and clean with a light brush

Next is the blower motor when the motor is running heat is created in the windings and the motor has holes on the ends of it to draw air in to cool it self while it is running. If these holes are blocked the motor will overheat constantly, and the result will be premature failure. to clean these air passages simply wipe with light brush.