Very odd flapping/rapping noise that seems to be coming from the front drivers side   Just recently had full 40 000 mile service and Indash ac repair. Have checked all outside panels. Nothing loose. Originally thought it was access door to generator and tightened that up. Still issue.  Thinking now it may be mechanical. It’s all good until we get up to 55-65 mph and then the noise starts and is very loud. Tried turning off every system i.e. ac. Cruise. Etc.  nothing seems to have an effect.