'85 190D A/C Question
 

This is a 5 spd manual with 565K miles. Still runs and drives like a dream...but yesterday when on interstate with A/C on the A/C, tach,
fan clutch all quit at once. Stayed off for rest of trip. This A. M. everything worked at first, then repeated. I noticed today when the other electric items quit the enging idled rough (usually idles very smoothly). Anyone have a suggestion of where to start looking?