'17's Higher pressure coolant system

Sportchassis06 · Dec 15, 2016

Just noticed my '17's Radiator cap is a 21 psi versus the 16 psi that '11 thru '16's have.What would be the consensus,for the change?

redneck1 · Dec 15, 2016

My 16 has a 21 psi cap, never figured out why the high pressure. Sounds like a recipe for more coolant leaks running that of pressures, but I dunno much about it..

KCCO

Inline6359 · Dec 15, 2016

Maybe I'm wrong here, but..

I do know raising the pressure in the system raises the boiling point. I also know coolant as a whole isn't that efficient in dissipating heat, water is, but water also freezes higher then coolant and boils at a lower temperature. Maybe it has something to do with the ability to run more water in the coolant for better heat dissipation and raising the boiling point so you can run more water? Maybe? Without knowing what changes were made from earlier systems with different caps requiring different coolants to now I'm just spit balling.

mandkole · Dec 15, 2016

Id say the coolant temps are driving the cap pressures for emissions. Don't they want them running 215F or so? Im familiar with some heavy truck engine programs and they have pressures on the top tank that may approach 45-50 psi.. its due more to coolant flow rates, but theres some heat gain as well.

Powerstroke Man 6.4 · Oct 11, 2017

Anyone ever figure out the reason why, Ford changed to a 21 psi cap?

Jomax · Oct 11, 2017

No idea, but the coolant looks pink now.. so I think they also changed coolants.

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BuiltPowerStrokeTough · Oct 11, 2017

Jomax said:
No idea, but the coolant looks pink now.. so I think they also changed coolants.

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I noticed this immediately when I opened the hood the first time on my 17. Used to be orange on my other 6.7s, now it is definitely a pink colored coolant. Wonder what they did different with the coolant if its something other than a color change.