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If you have the liquid cooled ptu you can remove the nuts and pry the cooler way from the ptu about 1/2 inch and drain the fluid. If you have the non-cooled ptu you could remove the cap where the cooler would be.

His would be the 2.7L V6 Twin Turbo.   I did my serpentine belt kit (belt, idler and tensioner) at 103K miles and would say that 100K miles is a good interval for this.

Update! A month or so ago, I was passing some trucks on the freeway, on boost, when the boost went away, the 'wrench' light came on, and cruise control would not work.  Got off the freeway, stopped for some coffee and on startup, the wrench went away, but the Check Engine Light (CEL) was on, and still no power or cruise control.    Forscan was showing me two codes, P0243 and P0299.  Both related to the turbocharger wastegate.    Okay, back to Ford service who, on two previous visits, gave me the 'no codes, no problem' blowoff and said something to the tune of, 'It's running normally'.  So now they acknowledge a problem with the 'wastegate solenoid', order a new part, and schedule the install.  They wouldn't give me the old part, but said I could look at it in the parts department.  So I did, and it did not look like any of the pictures I had seen of the vacuum based system everybody shows for the 2020 Edge.  I was p*ssed they just pulled something off the shelf to make the idiot customer go away.  But when I got home and looked under the car, sure enough there was a new version of the part they showed me at the dealer.  An electric motor version that looks like the 'control solenoid' is built in.  Researching that, it appears the wastegate controller on my engine is the same as that used on the 2021+ Lincoln Nautilus.  The build date on my car is December 2020, and the Edge and Nautilus are (were) built on the same assembly line, so it makes some sense there might have been some parts sharing, especially since that was the Covid era.   In the meantime, my brother, who bought an F-150 twin turbo brand new a few years back noticed some surging within a few days of taking delivery.  He took it back and the service manager said, 'no codes no problem', but he also said to try premium fuel, regardless of Ford and the manual saying it could handle the 87 octane bilge water.  He did that and the problem disappeared.   I did that too.  I am now running Tier 1 premium fuel, and with the wastegate fix, my car is running so good I am almost afraid to mention it, fearing I might jinx things.  Everything is better, the engine is smoother, even the transmission and its' goofy shift points and lockup strategy seems happier.  This is the car I was hoping for. Haven't checked the mileage yet.     Wish I could say which one of the changes did the trick, but I was desperate and the timing worked out that two things got changed more or less at the same time.     Next step is to scan things again myself to see if I can spot anything interesting.  But for now, this thing sure is fun to drive.   Good luck to you all          

I ran a can of BG44K cleaner through a few weeks ago.  I gained ~2 mpg from this I believe after looking at the mileage.  I am pretty sure this edge had never had the injector cleaner treatment before this.  So if you have an edge with more than 60K and have never had it done - I would say it is worth it.   I also switched at the last oil change to Valvoline restore and protect.  I have had good results with my wife's escape on this oil - so I will see how it does in the  Edge.

2009 MKX 3.5 check gas cap light issue with intermittent check engine light with P0455 Replaced gas cap. Lights were off. Got fuel a few days later and gas cap light came on the next day. It stayed on for a week and went out. Check engine light came on 2 days later with a P0455 code. Cleared light and all was good for a week. Check engine light returned and I cleared it again. Light was off for a few days and returned a day after getting fuel. Ive checked the purge valve by disconnecting the line and the wiring harness and running the car. It had no vacuum and I believe that means its good.    I do have a smoke machine and tried smoking the fuel filler pipe. Checked underneath and didn't seem like and smoke was escaping. Having a hard time with trying to find a spot to hook the smoker to on the EVAP lines under the hood. I did try smoking the inlet line that runs from the purge valve to the charcoal canister/fuel tank. It seemed to have a leak on the passenger side in the middle? That didn't seem right to me.  Has anyone had the gas cap light/ check engine light issue like this? What was your fix for it? Thanks in advance

YES   Try fixing the caps-lock.

If you check Lincoln app, it confirms fix is available and implies it could be OTA.

I did pull the drive shaft and the axle shafts on the RDU,  left the RDU unit installed, electrical connection connected, everything seems to be working just fine, no warning lights on the dash, I basically have a front wheel drive now. Hope the PTU stays good I change fluid every 15,000. I hated to do it but since ford is building junk these days and not backing their product i guess i had no choice, after buying a brand new RDU from ford and it goes bad in one year and eight months, definitely not any different than the Chinese junk

REAR AXLE BEARINGS , THEY CLAIMED FRONT OR REAR ( KUSATEC ) AXLE . MY CAR IS FWD . THESE ARE NOT SEALED , IS THAT BAD , OR WILL THEY GET DESTROYED . ???  

OEM valve?    If yes, believe I'd smoke the vac lines again, may have caused a crack or something.