Low speed humming/vibration noise

[tomolga68]

I have a 2013 Expedition 4x4 with 108K. I am hearing a humming/vibration noise coming from the front end when decelerating at low speeds 10-15 mph sporadically. It only seems to happen when the vehicle warms up as it is quiet when I first drive it or when it is very cold outside. I took it to my local mechanic who changed a wheel bearing they said was bad, but that did not help. After reading a few posts here, I put it in 4H and then back to 2H while it was making the noise and it seems to have gone away for now. I run it in 2H 99% of the time and only put it in 4A as needed. Was hoping for some guidance so I don't have to play guess the part with my mechanic. Thank you in advance for any insight or ideas.

 

[WhoaTed]

I have a 2013 Expedition 4x4 with 108K. I am hearing a humming/vibration noise coming from the front end when decelerating at low speeds 10-15 mph sporadically. It only seems to happen when the vehicle warms up as it is quiet when I first drive it or when it is very cold outside. I took it to my local mechanic who changed a wheel bearing they said was bad, but that did not help. After reading a few posts here, I put it in 4H and then back to 2H while it was making the noise and it seems to have gone away for now. I run it in 2H 99% of the time and only put it in 4A as needed. Was hoping for some guidance so I don't have to play guess the part with my mechanic. Thank you in advance for any insight or ideas.

Sounds like front hub actuator(s). That’s one of the many ways that they indicate one or both is bad, or that there’s an issue with vacuum (bad valve, broken tubing). Think of plastic slip ring with an integrated vacuum-operated “donut”. Actuator isn’t terribly expensive, and relatively easy to replace if you know which end of the wrench goes on the nut. Vacuum bits are even easier: diagnose & replace. Hope that helps.