Hello,
About 3 or 4x now after about 1 year of use each time, the serpentine belt keeps separating from itself (the last one was a Goodyear gatorback). I have replaced the tensioner assembly 2x and the idler pully at least 1x already within this period as well. Everything appears to be running straight in line with no wobble as I watch it run and simulate acceleration with the accelerator cable under the hood. It appears that the Gatorback last week that separated from one of the ribs looked like it started from the back side and not the ribbed side (I had to cut the rest of the ripped length off with a scissors to get home) . The rest of the belt looked fine with no cracks either. When I installed the new belt that night I cleaned the crud off the idler and the idler mounted on the tensioner assembly, but other than that, there were no nicks, wear marks, uneveness,etc...
Any of you have any ideas?