**EDIT: Guess what reared it's ugly head once it dropped below 20°F after not losing an ounce of coolant all year? That Y-Connector. Hopefully this is the final fix. Seems that the ambient temperature dependence is real. [ Ссылка ]

2013 F150 5.0 XLT. Trying to figure out why I'm losing coolant slowly. I've replaced the water pump, thermostat, and a bunch of orings. Still slowly losing coolant. ~135,000 miles.

This is the video I reference about the mechanic in a can. [ Ссылка ]

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