Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 2012 Navigator – Strangest sounds I ever heard – Siren › 2012 Navigator – Strangest sounds I ever heard – Siren
The unusual shifting nature of the sound is what really has me baffled. I sure wish someone could explain that to me.
That is fairly easy..
If it is a belt or drive accessory, it will shift speed along with engine rpm.
When your driving the engine rpm will change (lower) when going into higher gears.
It can sometimes disappear above a certain speed.