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2002 F350 with V10. A/C stopped blowing cold. I can hear the clutch clicking on and off, so probably needs refrigerant? Other thing is that with A/C off, the temp control **** turned to cold, and fan on, it blows hot air. On my other vehicles with A/C off and temp turned to cold, I get outside air at ambient temp.
I removed the cover off the evap core under the dash and observed the blend door opening and closing as the temp selector **** is moved. The duct door moves correctly, so am I'm missing something? Is there a hot water shut off valve in this system that may not be working? Is the Ford system such that ambient air is always heated? This happens even in cold temp conditions.