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Just picked up a high mileage 2012 and looking to do a transmission fluid change. I see the full capacity is 12 qts and the pan hold 7.5 qts. All the how-to articles show just draining the pan. Any easy ways to get the rest out? I would rather not contaminate my new oil with 4 qts of old oil? My old F-250 there was a way where you could unhook the tranny cooler line and start the vehicle with a clear hose on it and drain the rest of the fluid and refill so you could get a complete fluid change. Worked perfectly.
 

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Problem with your f150, as far as flushing the system thru cooler return line, is that your f150 trans has a thermostat above valve body for the cooling system. It is in a bypass state more than a open state.
So just removeing the return line, and doing that deal wont really do what you think.
You can remove the thermostat, with a certain part, and then yes can flush like you notmally would.
And have fun filling with oil. Or checking. It had a 2” dipstick. You can also buy a kit that uses a lokar dipstick so its an easy deal.
 

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Rather than open the return line, open the supply line going to the transmission cooler. There is youtube video of an Amsoil dealer doing this on an F150. I don't know if this gets everything in the torque converter or not. When I did mine, I just sucked out the old fluid and did a pan drop. After getting it hot and a few miles on it, I sucked the fluid out and replaced with fresh oil a second time. With a suction device you won't need to drop the pan, but you should drop it at least once to replace the filter.

I'm afraid the only way you're going to get a complete fluid change is to hook it up to a machine. If getting all of the fluid matters to you, just pay someone to do that.
 

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Haven't tackled it on the f150 yet, but on my Saab you pan drain, refill, and drive 50 miles. Then repeat 2 more times. This is how they recommend in the service manual. No easier way to do it. Makes a huge difference and the fluid is clear AF after the last change. I will probably do the same on truck.
 

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Rather than open the return line, open the supply line going to the transmission cooler. There is youtube video of an Amsoil dealer doing this on an F150. I don't know if this gets everything in the torque converter or not. When I did mine, I just sucked out the old fluid and did a pan drop. After getting it hot and a few miles on it, I sucked the fluid out and replaced with fresh oil a second time. With a suction device you won't need to drop the pan, but you should drop it at least once to replace the filter.

I'm afraid the only way you're going to get a complete fluid change is to hook it up to a machine. If getting all of the fluid matters to you, just pay someone to do that.
I was going to do it myself, but I called the dealer to check first. For $250 they dropped the pan, changed the filter, and removed/refilled all fluid. I didn't think $250 was bad at all for parts/fluid/labor. It took them two hours start to finish.

Baaaaaaaaaaa
 

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Yeah that's reasonable. My local dealer wanted $375 to do it. I said no way. For ~$100 I bought a case of fluid, the pan gasket, the filter and did it myself for free.
 

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Problem with your f150, as far as flushing the system thru cooler return line, is that your f150 trans has a thermostat above valve body for the cooling system. It is in a bypass state more than a open state.
So just removeing the return line, and doing that deal wont really do what you think.
You can remove the thermostat, with a certain part, and then yes can flush like you notmally would.
And have fun filling with oil. Or checking. It had a 2” dipstick. You can also buy a kit that uses a lokar dipstick so its an easy deal.
What is the part number of the item you mentioned to remove the trans thermostat?
 

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Rather than open the return line, open the supply line going to the transmission cooler. There is youtube video of an Amsoil dealer doing this on an F150. I don't know if this gets everything in the torque converter or not. When I did mine, I just sucked out the old fluid and did a pan drop. After getting it hot and a few miles on it, I sucked the fluid out and replaced with fresh oil a second time. With a suction device you won't need to drop the pan, but you should drop it at least once to replace the filter.

I'm afraid the only way you're going to get a complete fluid change is to hook it up to a machine. If getting all of the fluid matters to you, just pay someone to do that.
What suction device did you use? Looking for a recommendation on this tool for when I swap fluid on my trans. I would really like to not make a mess in my driveway.
 

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https://www.amazon.com/gp/aw/d/B016YW6XL2?psc=1&ref=yo_pop_mb_pd_title

You'll need an air compressor. The end of the hose comes off, which leaves you about 3 feet of rubber tubing that you can twist and shove down the fill hole. After about 4-5 fill and dumps, when the pan was removed there was only about a quart or so remaining in the lowest reaches. Worked really well and allows you to change some of the oil even if you don't want to drop the pan.Like I said, I pulled and swapped more oil the next day after running the tranny hard. Oil was still a little dark.
 
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