If you pull up on the belt between the PS pulley and the upper idler and see the tensioner moving back and forth, replace it.
The updated part has a plastic pulley and a 15mm bolt in it. The old one uses a 13mm bolt. The 15mm wrench makes the job much easier with more leverage.

95 Contour GL. Bought new. BAT Sway Bars/Pioneer CD/Koni Rear Struts/Mobil Fluids. Looking for 15" alloy rims-PM me. 180,500km's so far.