How do you replace the belt tensioner?
Support the car with a jack stand and then support the engine with a jack under the oil pan (use a piece of soft lumber between the jack and the pan or you’ll be removing the pan to fix it). Remove the passenger’s front wheel. Remove the push pins holding the weather shield. Remove the shield. Remove the upper motor mount. Remove the belt. The belt tensioner is held in by two bolts. Raise the engine with jack carefully until you can get your hand in to remove the top tensioner bolt. Lower the motor with the jack very slowly until you can access the bottom bolt and remove it. The tensioner will come out through the fenderwell. Put the new one in the same way. Put the bottom bolt back, raise the engine, top bolt, level the engine, attach the belt, reinstall the motor mount, weathershield and wheel. If you forget the weathershield your belt might squeak when it rains. If this sounds like a pain in the neck, take it your local shop.