Shop for New Auto Parts at 1AAuto.com http://1aau.to/c/112/bo/blower-motor Is there a rattling noise coming from the vents in your car or truck when you run the heat or air conditioning? In this video, Len shows you how to check out smells, noises, and other problems related to the air vents in your car or truck. Rattling noise can come from a broken blower motor cage, or debris being trapped inside it. Problems with vent speeds are probably due to a faulty blower motor resistor. Smells and other problems could be a result of a dirty or missing cabin air filter! To find out what you need to know to solve your vent problems, check out this video!