Agreed, the PM is pretty cheap.

 

FWIW I think they know you can't get all the old coolant out which is why typically once you do the first coolant change, subsequent ones are done on a shorter schedule.

 

I just changed mine out to the yellow prestone for all makes and models on my 16 3.5 ecoboost this past weekend. What I did was drain the radiator and then screwed the plug back in. After that I disconnected the top hose going back into the radiator and filled the radiator back up. Cranked up the vehicle and let it warm up letting what seemed to be all of the orange coolant flow out of the top radiator hose into a bucket until I saw it good and yellow. I think Ill drain the radiator again this weekend to see if I got all of the orange out or if some still remains mixed. If so Ill do it a few times until im satisfied I got most of the old out.

 

Just picked up 2 gal of Motorcraft yellow concentrate from a local Ford dealership for less than $35 with tax

 

See here is what I don't understand about doing a complete flush as in post 13, with no block drains all that tap water is now trapped in the engine block minerals and all.
That doesn't make sense to me.
If the factory filled these trucks from new with distilled water as they tell the techs and owners to do there should be no scale build up.
I'm almost leaning to just drain old coolant as much as possible and flush with distilled water once, circulate, dump and refill with concentrate.

 

I just flushed mine a few months ago, check out this thread:

https://www.f150forum.com/f118/flush...system-477664/

 

Thanks I forgot about that thread.
Honestly that is probably the way to go, for a system that isn't all contaminated with rusty scaly brown crap.

 

That’s basically what I did - see the link in my post a little further up. Except I did the circulate and dump like 6 times. To do it again I’d keep the radiator petcock open, let the engine run and manually fill the radiator with distilled water rather that do it in chunks (ie close petcock, run engine, drain, fill with distilled, repeat...).

The rad drains so slow that it would be easy to fill with distilled water and keep up as it drains. Then do a final rad drain and fill with concentrate and you’re close to 50/50.

 

Did you remove the old thermostat like I did?

 

You can purchase premix from rock auto for less than $12.00 a gallon. My ford dealer sells it for $13.00 a gallon VC13DLG

https://www.rockauto.com/en/parts/mo...tifreeze,11393