2011 Ford F-150 XLT 4dr SuperCrew Styleside 5.5 ft. SB (3.7L 6cyl 6A)
a 2011 F-150 Crew with 3.7L V6 mainly for gas mileage.
2 months later when the temperature outside got over 90 and in traffic, the truck had a vibration or resonance in the cab when idling with A/C and cooling fans running.
I brought the truck to the dealer, but they could not find anything.
I noticed another F- 150 with the 3.6 V6 that had revisions to the exhaust piping (Braided hose right before muffler and different mounts).
I showed a picture to the Service Rep.
He said he asked Ford Hot Line and they know nothing about it.
I feel the vibration was coming from the exhaust system.
It was so annoying, I traded the truck in for an Fx2 with 5.0L, big difference.