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Performance Upgrades - Maintenance - Modifications - Problem Solving - Off-Road - Street Trucks. Covering the Explorer, ST, Sport, Lincoln Aviator, Sport Trac, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Aerostar. Featuring H.I. - Human Intelligence.
I believe it's the ambient temperature sending unit for the overhead display counsel with the compass.
https://www.explorerforum.com/forums/threads/outside-air-temperature-sensor.214008/
I had these pics on my phone from when I had to open mine five or so years ago. I lowered the rubber on threaded-rod bump stops a tad to prevent it from being too tightly closed.
We battled the flashing 4WD lights on our '95 and created our own workaround solution. In the years since we haven't had the need to take it out of 2WD so who knows ir we lost 4WD? I THINK remembering that we could still hear the servo changing the transfer case. Find a spare relay and give it a...
Concerning the thumping sound, possibly the blend door... Our '95 does the same if temp fully clockwise. If we back off to roughly 3 o'clock position it's silent.
Good luck!
[Edited to 3 o'clock position from 9 o'clock.]