What is this part? It vibrates and makes noises after I turn off the truck.

[tacorancher]

It’s inverter coolant

Makes sense given it’s next to the inverter. Does the turbo intercooler share the main engine coolant?

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[StreeTaco]

Makes sense given it’s next to the inverter. Does the turbo intercooler share the main engine coolant?

Yes, the intercooler and turbo pull from the main expansion tank

 

[evlfred]

Yes, the intercooler and turbo pull from the main expansion tank

Any idea where the hydraulic pressure for the booster comes from, does it have a dedicated pump somewhere?

 

[StreeTaco]

Pretty sure it’s what the OP posted pics of

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