Ford documents refer to it as a "Sunroof Cable" even though it's for the shade.  There's a sku for the driver side and a different sku for the right.  The sku for the left/driver side is FT4Z-58500B01-B.  Tons of parts places online offer it for $130-250.  Try your local dealer first, but mine wanted full retail. Open the shade and open the glass roof all the way first.  You have to drop the headliner, which means you need to remove the A, B, and C pillar plastics, the overhead console, the seat belts, grab handles, and visors.  That takes close to three hours.  The screw covers for the visors are pretty much impossible to remove without breaking the one of the two tabs.  The overhead console is more delicate than most people think, so be super careful with it (review youtube thoroughly for that one).  You have to take special care to remove the C pillar plastics since one fastener is supposed to pull out of the metal body hole without pulling it off the plastic.  You'll have to giggle it around a lot and pay attention to the slot shape to get it out, otherwise you'll break the plastic. Once the headliner is down, you'll have to unscrew one star bit screw on each side of the glass roof bracket (using a long shaft).  There are two motors in the rear above the headliner.  One is for the shade and the other is for the glass.  Once you remove the three screws for the motor, one cable can be replaced in about 15 minutes. If you're considering a rear camera for your dashcam, this is a good time to run wire through the rubber conduit between the chassis and the tailgate.

@b2t Any updates on this fix? From what I can tell, these parts are called guide clips. I had the drivers side break on my 2018 a few months ago and it was still functioning fine. I tried to adjust it a bit and put too much pressure on the remaining guide clip and the second one snapped as well after a few months. Very unpleasant driving around with an exposed glass ceiling in this 115° Arizona heat, let me tell you. Would love to hear how you went about it. I was quoted $1977.50 for this fix by my ford dealer. 

Cheap gas is not worth the risk.  Remember this post originated from buying cheap gas and a check engine light. That should be a red flag for all of us. Thank you for the post. It just enforces my belief that good top tier high octane fuel is beneficial. Maybe not such a big deal for a non-turbocharged engine???

OK, that's good. How about the second part of the question?

It's a motorcraft alternator 

Hey, use whatever you want for fuel.  Your money.  Your car.   You are only running an SEL.  STBeast and myself are running an ST.  Clearly states in the manual for premium fuel, not the cheapest we can find. I would never use cheap fuel, ie; 87 octane in a turbocharged car unless I was desperate and there was nothing else available, and only then just enough to get me to the next station.   Since you apparently used an unknown station, or one you would not normally use, may very well have gotten a bad tank of contaminated fuel.

A lot of either wrong manuals in your vehicles infotainment system, or...who knows. Creative interpretation?   E15 is okay for 2001 and newer vehicles, some are grand fathered in due to the EPA testing them.   Every Ford Edge. 2013 or newer, in the owners manual, states that not more than 15% ethanol. You know what is not more than 15%???? 15%.   Sure, if I had bottomless pockets, or didn't drive 22,000 miles a year, or didn't have a appliance CUV, sure, always 91/93 pure gas 0% ethanol. Especially if it sat with a tank of gas for more than a few days, which mine doesn't. https://www.fordservicecontent.com/Ford_Content/vdirsnet/OwnerManual/Home/Content?variantid=9611&languageCode=en&countryCode=USA&moidRef=G2126645&Uid=G2170137&ProcUid=G2134123&userMarket=usa&div=f&vFilteringEnabled=False&buildtype=we

For anyone domestic looking for these connectors, I had luck with these ones on eBay. All three of the OEM connectors were totally fried on my 2008 edge so I rewired both the fan sides and relay side with these, seems to have fixed my issues. Hope this helps.   https://www.ebay.com/itm/318672639358

The Edge is not a FlexFuel vehicle, hence not designed to run on anything more than 10% ethanol.   IIRC, 93 Octane seems to be more of an East Coast thing, ie; more prevalent than on the West Coast.

Just revisiting this - fairly risky to drain the coolant with it at normal operating temperature and even if that was done, it would be well below operating temperature with the new cold coolant just added and would take longer than 10 minutes to get back up to operating temperature.