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well you replace the whole tensioner arm, which will have a new pulley on it. the spring in the arm goes bad, that means the pulley does little to nothing in keeping tension on the belt. the fact that the pulley moving back and forth tells you the spring is shot.
there is a little stick man illustration sticker under the hood showing how to release belt tension by moving the tensioner arm. if the serpentine belt is still on the lower pulley then put the belt on everything except the tensioner, then move the tensioner arm as needed, put the belt in there and release the tensioner arm. most likely going to need two people to do this.
if the belt has come off the lower pulley then you are going to have to remove the service panel behind the right front wheel and put the belt back on lower pulley, then do as above described. this would be a great time to put a new tensioner, a new serpentine belt, and a new "dog bone" motor mount on as it will all be right there to work on with that service panel out.
there is a tensioner for the serpentine belt, it is spring loaded so it adjusts by itself. if the belt is loose then the spring in the tensioner has gone south. you need a new tensioner, about 50 bucks but replacing it is beyond normal owner servicing. there are many videos of folks replacing tensioners on youtube. note the tools they have, and most videos are shot from under a lift. if you have all those on hand, then you would not have asked the question. buy the part and take it to a repair shop.
I do not know what your mileage is but if you are over 110,000 in a DOHC then a cam chain is in order unless it has already been done. when you do it get a kit as the are guides, sprockets, and a tensioner needed as well. when you are putting it back together do the serpentine belt tensioner and the dog bone motor mounts. generally a cam chain sounds more like loud whirr than click. sticky valves click, but that generally goes away as the engine warms up. a/c clutch could make a click cutting in and out if the system is dry and there is nothing to compress. have you tried this in park with the hood open and someone else hitting the gas pedal to hit the magic rpm? you might see something attending the click or get some better idea as to exact location.
Get a new belt, you will need to know whether SL2 DOHC or SL1 SOHC and whether or not you have A/C to get the proper belt. Remove the right front tire and put car on a jack stand, remove the plastic service panel behind the wheel. There is a little picture on the radiator cross member of a wrench on the tensioner. You are going to have to get a long open end wrench on the tensioner, and make it longer with a homemade extender, relax the tensioner and have a helper then pull the belt off. Replace with new belt by reversing process. The dog bone mount will be in your face behind the service panel you may want to replace it while you are at it and the tensioner too if it has not already been replaced.
Check to make sure there is enough tension on the belt. Belt tensioners are pretty common on these to fail. If there seems to be enough tension try taking off the belt and putting it back on so it rotates the other way. If the noise stops replace the belt. Flipping it just helped you confirm it was the belt and not something else.
If I remember right, the tensioner has a preset spring in it. You cant tighten it yourself the old fashion way. You'll need a new tensioner. When you put it in, use a torque bar with a 1/4" square end and torque on the spring until the belt slides over the pulley.
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