2016 3rd Row Seat Clicking

[VRAND]

So I lowered the 3rd row seat and raised it again with the switch (of course) and now I can hear clicking noises coming from the passenger rear cowl near the seat control switch at a regular interval -- is there a relay or limit switch or actuator acting up under there or?

 

[Axle Folly]

Great intuition. Here's a link to a site showing the location of a relay box on that side of the vehicle:

Fuse box diagram Ford Expedition MK2 2002-2006

Location of fuse boxes (fuse box diagrams, relays, and their purpose) for Ford Expedition second generation (2002, 2003, 2004, 2005, 2006).

fusesdiagram.com

I've got the wiring diagram manual (but it doesn't show locations). It takes 3 pages of wiring diagrams for the third row seat controls! It calls out:
"Auxiliary Relay Box
11-6
156-26"
Also, there's a Power-Fold Seat Module (PFSM) 151-24 151-27 that may also be worth a look.

 

[VRAND]

Turned out it was a failed rear HVAC blend actuator that decided to fail after I repositioned the rear seat - great timing - thanks for the suggestions

 

[Goofy173]

Dang. Beat me. Was gonna say it's the rear HVAC. Very very common. Even my 2 GM Trailblazers do this!