1998 Saturn SL2

Engine Mechanical problem
1998 Saturn SL2 4 cyl Front Wheel Drive Automatic 182500 miles

My car had horrible symptoms like it was possesed, when I start my car and turn the wheel, it was as if I had no power steering, and the tranny would jump, my gauges were working and than would stop working, all gauge lights would light suddenly than stop. Than it died, I looked at the belt, and it had no tension at all. I figured I need to replace my serpentine belt tensioner. My question is are all these symptoms related to a bad tensioner, and how hard is it to replace this?
November 5, 2008.

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