There's a rod that connects the front panel under the hood to the chasis. The front panel will include such things as cooler, coolant overflow tank, etc. Usually there's one on each side. If this comes loose you'll hear a banging. Check both. If it's missing the rubber grommet go to NAPA and purchase a rubber plug. The plug comes with a big chunk of rubber with a small hole in the middle and two washers and a nut and bolt. Remove the nut and bolt and use the rubber and washers to replace the missing parts. Check the other side of your RV to see how that one is doing. If it's loose, tighten it. Use lock nut to keep the nut from vibrating off again.
