It’s a coolant system that cools the fuel and vgt actuator, there is an auxiliary pump on the drivers side behind the fan shroud.
You fill it by opening the black reservoir on the fuel cooler and also opening the 8mm inverted hex on the turbo and fill the black reservoir until coolant comes out of the vgt actuator side. You’re to do this while the the pump is running.. ie engine at operating temp


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It’s a coolant system that cools the fuel and vgt actuator, there is an auxiliary pump on the drivers side behind the fan shroud. You fill it by opening the black reservoir on the fuel cooler and also opening the 8mm inverted hex on the turbo and fill the black reservoir until coolant comes out of the vgt actuator side. You’re to do this while the the pump is running.. ie engine at operating temp.

Thanks, Roccafellas. I'm familiar with the fuel cooler, but not the VGT actuator, or the Allen on the turbo - I'll have to look into that before I refill the system for real.

You may be the person to answer a more elaborate question on this subject. In the many pages of comments I read regarding a cooling system flush procedure, there was some debate regarding the interaction, if any, between that system and the primary system. Some people claimed they are connected, others claim they are separate. They appear to be separate, based on to the schematic I saw in a Ford manual (if my memory serves well, and it often doesn't). In my real-world investigation, they are clearly connected.

My question, then, is WTF? (Interpret/answer that however you see fit.) I just don't understand why they are considered separate systems.

 

The engine coolant is too hot. To cool both of those systems especially fuel. Fuel temp is around 140-150. Coolant will usually be 180*


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They are separate if you drain engine coolant you will NOT drain this cooling system. The radiator is on the left front of the intercooler in the front.


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Is this that reverse hex? I was under there to check my cab mounts and noticed this leak dripping down. Wanted to confirm that's the secondary cooling system.

 

You’re showing me the steering gear and pitman arm. The Reverse HEX is on the VGT actuator cooler.


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Reverse HEX on the left by the white sticker 8mm


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Ah ok. Thanks. I saw a hex and thought they might have mounted the steering to it for some reason. Blame it on being a dumb diesel noob. Still learning.

Thanks for the clarification

 

what? Coolant in your steering! Haha jk, all good my friend.


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I went back out to check and couldn't tell; ragweed and air quality are playing havoc on my sinus's right now. Whatever it is has the whole thing soaked from the bottom, and I couldn't see any sign of the leak at all from the top of the hood.

Degas bottle has coolant in it, isn't low and hasn't needed to be filled.

Of course my truck is stock right there, so it's a PITA to see that location from the top through all the hoses and see what it could be

 

Seeing as how it’s solely the steering gear that’s wet. I would assume it’s that.


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