However, not all owners are satisfied by the TSB because it doesn’t address another whistling sound they’re convinced is coming from the driver-side mirror. In all likelihood, Ford has not yet discovered a gap or gaps in the mirror housing. One owner’s temporary solution was to cover the gap with electrical tape. Others figured out a fix by placing their hand in front of the mirror or by slightly turning it.
Of course, all of this is temporary and it’s up to Ford to fully resolve things. For now, there’s just one whistling-related TSB for the hood and hopefully, a second one addressing the side mirror is forthcoming.