They seem to all do that, some people complain, some don't. Ive replaced a bunch of upper hoses and degas caps to fix it, and within 6 months or so, the same thing happens.
What year is your truck? If its an 11_14, check the fitting on the top of the turbo, theyre pretty common to leak. Also, check the water pump and drivers side of the radiator tank where it crimps to the core. If your truck is a 15+ check the water pump and radiator, the updated coolant line to the turbo doesnt have a tendency to leak.
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