How do you fix or change tensioner pulley?

Answer 1

The tensioner pulley has a sealed bearing and cannot be serviced, it must be replaced when it goes bad. You should inspect the tensioner assembly carefully before replacing just the pulley, the mounting bolt tends to literally wear right through the arm on a lot of the factory tensioners, causing them to eventually fly apart and throw the belt. If you notice any play or binding in the arm, replace the whole thing.

I would need to know the model year and engine size for more specific instructions, but in general, the 4-cylinder tensioner is straightforward, just remove the bolt and replace the part. The V6 takes a little more work, there's not enough room to work from above, so you need to remove the passenger's side wheel and splash shield and work through the wheel well.