1004ron

Is this your own vehicle and if so have you noticed any performance impact at the onset of the noise? As a test you could run it with the serpentine belt removed.

Check the reports in the below link - sounds similar to what you're experiencing and the repairs are costly out of warranty. https://www.fordforums.com/threads/2019-ford-edge-sel-trans-issues.315266/?utm_source=google&utm_medium=organic

If you asked them to "change all fluids" that would not necessarily include the transmission seeing as its not listed as due for replacement in their documentation.

@fh4ever with it still under the Ford warranty make sure the service writer checks it in with the written concern clearly spelt out on the job sheet and that way you'll have a legal record in the event there's a failure after the warranty period. Also a good idea to contact Ford Corporate and let them know that you don't believe the dealership tech has fully understood and investigated the concerns. Yes, a second dealership is a good idea. The specialist transmission shop is good, but with it being under warranty I'd pursue Ford first.

Transmission fluid change at 30~40K miles might be prudent for a vehicle that's frequently used for towing, otherwise around 50~60K miles for typical use - being a used vehicle with unknown history is may be good insurance to change it early. @fh4ever I have owned other vehicles that exhibited similar transmission behaviour you describe and it was considered normal. If still in doubt take a test drive in a similar vehicle at your local Ford Dealership, and if still in doubt after that have it checked by a transmission specialist shop. Do you still have warranty on your vehicle? - if so submit a warranty request.

I did all sorts of bench tests on the Dorman and based on those tests I assumed it must work, but after a good web search found that for reasons unknown the 3rd party evap valves don't work - installing a Motocraft confirmed the search results.

@RPGR90s I have used the Dorman evap purge valve and it did not work, or didn't work for long. I don't know what it is and why the third party valves don't work but can confirm that the Motocraft replacements do work. The current one I bought from this eBay seller and its been working for one year. Genuine Ford Vapor Canister Purge Solenoid GL3Z-9B325-B | eBay Get the free Forscan Lite to use with an OBDII adapter to read and reset codes. You'll find the PDF's in this thread showing the location of the canister - it's not easy to access.

Cant explain what you encountered but would recommend alignment soon after the new tires are installed.

I would not deviate from the oil weight listed in the owner's manual - is that what's being suggested?

The 2010 just like my 2017 the PTU takes 75W-140 I use AMSOIL SEVERE GEAR® 75W-140 100% Synthetic Gear Lube

Thanks for the comments and suggestions. The whine can be heard accelerating/decelerating with or without braking. I might hold-off buying parts until after the next service at which time I'll inspect the driveshaft, change PTU and RDU oils and check the drained oil. The tires have just under 10K miles on them - P Zeros bought and installed at Costco - I did inspect them and there's no sign of wear let alone cupping etc.

I've held off buying parts to address this whining/humming noise because I'm unsure of what's actually causing it. Well, its got worse and it's loudest between 40 and 60 mph and doesn't respond to acceleration or deceleration so I'm leaning towards it being a wheel bearing, and I'm not sure if its front or rear. I'm thinking of getting four of the SKF BR931101 for around $100 each on RockAuto in the hope that will cure the irritating noise - or wait until it gets a lot worse making it more evident.

Clearly the alternator isn't working and its possible that could be causing some or all of the issues preventing the engine from running when the battery drops too low. Those codes would not prevent it from running. Is the power to the coils with just the ignition ON ?

I would start by scanning for codes using Forscan. Where did you get the replacement alternator? - its widely reported that non-OEM alternators or rebuilt alternators don't work and the voltage at 12.2 confirms that.

Carfax shows "Status: Remedy Not Yet Available". Could it be that the local Ford parts department has stock of the old hoses?