You may want to try taking apart your vent system and making sure there are no debris inside. Some car disassembly is required.SilvaIS300 said:not tryin to hijack the thread or anything, but i have what sounds like a small marble rolling around in my center a/c vents up front. i haven't actually put my ear to the vent but by driving the car and sitting the the different passenger seats that's where it seems to come from. It gets really annoying and happens when i gas, brake, turn left or right. Anyone have this prob? thanks guys![]()