How do you install a serpentine belt on a 1990 Lincoln Continental?

Observe how the belt runs across the pulleys. Now find the belt tensioner( it has a pulley and is usually located toward the top of the belt pathway).The belt tensioner is spring loaded and they have a provision for a 1/2" or 3/8 ratchet to be inserted to pry to relieve the tension in order to remove the belt. At this point remove the belt and reinstall the new one.If your model does not have this provision, a tool by the LISLE company is available at NAPA stores for belt removal. I hope this helps you. Mark

All stepps above are correct except: There is no sprin on this model year. There is a nut behind the idler pully arm that must be loosend. then the tention will be relieved. retighten the nut while prying with a 1/2' ratchet or breaker bar.