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Message: <blockquote data-quote="SkidTracks" data-source="post: 142738" data-attributes="member: 5570">I believe you can rule out Fan switch, since you say fan works fine and heat works.  You should feel air coming out of vents, even though A/C isn't working.  Exception would be evaporator coils freezing up (coils below cab), resulting in air being blocked.On a hot day, with A/C fan on High, Temperature cranked to Coldest setting, Cab door and windows open, the A/C compressor should be on almost continuously (compressor's hub is turning with drive pulley - compressor clutch engaged).If compress's hub isn't turning most of time:There is possibility A/C is low on charge (compressor starving for Freon).  Which would indicate a Freon leak.   On my T870, it took fluorescing dye in A/C system and parking machine in a deep shaded area to see dye at compressor's hub.  Dealer's service team missed leak because of bright shop lights.Along with possibility of intermittent wire/connection going to compressor's clutch which engages hub to be turn by drive pulley.  Normally such an intermittent connection is seen when machine is being used (going over bumps); not while parked - idling.</blockquote>