Yellow still clogs the heater core just like the orange. Just went through this on my july 2019 build 5.0 took 6 weeks for the dealer to get the heater core replaced under my warranty.
was clogged up so much it barely trickled out when they attached it to the flush machine. BTW I live on the coast of texas, almost never need heater. truck was at 99k miles. System had never been opened up.

 

Maybe I am just lucky, but I have never had an issue with Dexcool (Ford orange) coolant, and I have had vehicles that used it since 1994. In the past I have completely flushed my coolant every 3 years, because that is what was called for. Just like with oil changes, the OEMs have stretched out the recommended coolant change intervals. I usually stick with "severe service" intervals since the vast majority of us drive under those conditions, myself included.

I put 200k miles on a 1992 Grand Caravan that I switched over to Dexcool at the 3 year old mark. That said, I will be switching my 2015 over to the Ford yellow this year. I also need to flush the wife's 2014 Charger, which had Dexcool as factory fill. It's at 106k miles without any coolant issues. I haven't decided what I will use in it; I may stick with Dexcool since I also have a 2012 Grand Sport Corvette that uses Dexcool.

Just like with most automotive items, I believe and have experienced that timely maintenance is most important to a long service life without issues. How many of you have never done a brake fluid flush so that optimal braking is maintained?

 

So for those who did a standard drain and fill without any sort of flushing. How much prediluted coolant did you need?

 

I did two sequential drain and fills in my 2015 5.0. Used about 2 2/3 gallons. A drain and fill only gets about a third of the coolant out, so it is not optimal. Two drain and fills gets a little over half of the old coolant out. I'll probably be doing a flush in a couple of years (or more likely paying someone to do it so I don't have to deal with the mess).

 

Thanks,
I'd rather drain and fill every couple of years than let some of these shops touch the truck. At least the quality degradation is known that way.

 

I did multiple flushes with distilled water until it looked like there was no trace of the old coolant. I then filled with the concentrated yellow with whatever distilled water was still in the block. Worked perfectly to get a 50/50 mix.

I use a coolant vacuum fill tool to get all the coolant in and as much as the coolant in the block out as possible.

 

About the same here with my 2.7L.

 

I always flush the system when I service it. I drain, fill, drain.......until I have nothing but clear water coming out. It typically takes about 5 cycles. I then drain a last time, close the petcock, and fill with antifreeze concentrate. My experience is that the drained radiator holds just about half of the total coolant capacity, so you are very close to a 50/50 mix when using concentrate. I have found the 50% radiator capacity has held true for every vehicle I have serviced for about 45 years now. YMMV for others. 🤷

 

I agree completely. That's why the change interval between drain and fills on all vehicles are a lot shorter than the first fill from the factory. I did the drain and fill on my truck with the new yellow coolant and it still looks orange when you're done.

 

YEP...do the same thing...the vacuum tool I use also allows you to pressurize the system which allows me to get a little more of the water out of the block.

I always buy the concentrate... not pre diluted... since I am using the distilled water to do my flushes.