I have a 2014 E350XLT. It is a passenger van, and I added a 4th row seat to it. Some time back, the rear fan stopped working. Ironically, a few weeks ago, the front did too, and I had to replace the blower motor (That fixed it). I am now looking at the rear- the front consists of the switch, resistor, and motor. Is the rear the same? If so, where are the parts located, and am I more likely to have a bad blower or a bad resistor? Does anyone have a diagram or other resources that might be helpful? Thanks- I appreciate any help!

 

I don't have a 2014 wiring diagram but the 2010 diagram (the latest I have) shows a couple of additional relays mounted next to the resistor. These are on the outside of the aux blower duct just after the blower outlet.

It probably makes sense to get access to that area and go from there.

The 2010 diagram shows that the rear blower won't run if the front control is in the OFF position and that there's an auxiliary speed relay that bypasses the resistor if the rear is set to HIGH.