It is weird in that only one facet of the mirror cover is blistered. Even going back to the "reflection/magnifying glass" theory, surprised there isn't wider spread blistering.
Our highest temp in November was 59. I doubt there's been enough solar energy here to heat anything that much, even with a reflection, in months.
But think of the number of F-150s out there, parked a bunch of different hotter and brighter places at all different angles in front of office...
There's not a lot of glass on our garage doors, one pane up high.
But surely someone has parked an F-150 somewhere where there are reflections from the sun before?
It shows the view to the rear, not the view to the side.
If the "rear view mirror" was labelled based on its location, it would be the center mirror, instead of the side view.
So there are three rear-view mirrors (that show views to the rear), two located at the side, one interior. You're welcome.
No chemicals and it has just been sitting outside my house on a concrete apron.
Other mirror is fine.
Also, I understand reflections can heat things up but a) c'mon Ford this is a truck and b) I live in eastern WA not AZ or NV.
The bolt doesn't take any of the load you are pulling. The splines do. They mention spline failures, but I have not heard of even one. That said, it is a failure you wouldn't want.
It also says that outside of vehicle at dealer. (on supplement 3)
"To guarantee the shortest delivery time, an emergency order for parts must be placed."
Read the most recent recall bulletin.
They found out the spline machining wasn't right (not sure, may be the design?) which was allowing the half shaft to move inside the hub, which eventually will break the bolt. The solution is a new design half shaft (I think they might have also switched to...
It has very little load on it, you don't need a 12.9. The issue is the machining of the splines.
They've already admitted the bolt replacement program wasn't effective because they found out the actual root cause: the splines.