I just ordered the parts form Rock-Auto and that included 2 gallons of the Yellow Coolant. including shipping it was $62.
There is a video on you-tube that shows the job being done on an F-150... that is why I am going to do it myself.
it should be a relatively quick and easy DIY repair, and I have a receipt for the Motorcraft parts to help prove that I am maintaining my vehicle to keep my extended warranty valid (in case there is ever a question).
119K 2019 Expedition Limited...
So I got the thermostat changed out yesterday between rain (north of Seattle and December lol)
All in all it was about 3 hour job for me to do on my own. I put it on ramps to get under the driver's side to attach a 1/2".o.d.with 3/8" i.d. vinyl tube to the radiator drain barb, and then drained out 1.25 gallons of fluid. Into a couple of old milk jugs. I closed the drain valve and removed the tubing.
Next came the topside work...
I then unplugged the sensor cable on the Air intake "Y" tube... to the turbos.
Then it was my deep socket 8 mm 1/4" ratchet getting the 3 bolts off the thermostat housing.
I pulled the housing back far enough to pull out the old thermostat. There was some corrosion looking stuff on the brass plunger end... Similar as that seen on a YouTube video...
Put a new OEM gasket on the new thermostat. Used a little bit of coolant to lubricate the o-ring, and installed it back into it's hole.
I got the first two bolts back in but dropped the third one... Extendible magnetic tip rod was my friend. Got #3 bolt in and that closed up the coolant loop.
Then reinstalled the "Y" tube to the turbo tubes and air filter box.
I poured in almost a gallon of coolant and followed the refill instructions from the Chilton's Automotive library... (Free access through my public library)... Granted I followed the 2018 instructions because 2019 only has the TSBs still...
Any way after filling up coolant.
Turn of climate control system
Turn on motor idle for 1 minute.
Run it to 3500rpm for 1 minute
Idle for 30 seconds. Then turn off.
Check for leaks...
Then since I did not have my vacuum coolant kit, yet...
I turned on the engine and let it idle to operating conditions, (noted by the radiator fan cycling)
Then it was 10 rounds of
Turn on motor.
Run it to 3500rpm for 30 seconds
Idle for 30 seconds.
Then turn off for 1 minute.
After round 10 the system is allegedly purged.
(I am going to check it with my vacuum coolant kit before any major driving...)
I let it cool off and finally added the remainder of the 1.25 gallons of coolant to get it back to max fill line when cold.
So far so good.