hi scotty, i have a 2004 ford expedition xlt, and the ac is malfunctioning. i turn it to 1,2,3 and…

hi scotty,
i have a 2004 ford expedition xlt, and the ac is malfunctioning. i turn it to 1,2,3 and it wont work. i turn the dial to 4, and it blows. oddly, the ac commonly blows through the defroster. i do have the setting set to the face vent

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