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Hoping it is just the evaporator sensor and should be covered under warranty. This seems to be a systemic issue with certain model Ford Trucks. Hoping Ford Reps will jump into this thread and discuss the issue and solutions.
Exact same issue here on new 2022 F-150 Powerboost Lariat with less than 1000 miles. A/C start off strong and then fades fast. Very hot cabin. Did Ford identify a fix? Happy with truck other than poor and inconsistent A/C performance.