Hi I have a 02 5.3L silverado extended cab 4x4 with 160k on it. The fan belt has started squeaking all the time. So I replace the Belt and it was quit for a couple days. I went to the lake which is a hr away. Then the next morning it started making noise again when the engine was cool. When It warmed up the noise went away. So I replace the Idler pulley which felt a little rough. That did not make much of a difference. Still made noise when it was cool and was quit when it warmed up. So I replace the belt tensioner and pulley. Now this morning it Squeak the hole way to work and was louder. I can not pin point where it is squeaking from or if it is everywhere on the belt. Could a alternator cause enough drag on the belt to make it squeak. I am getting tired of change thing out and not have much luck and making it worse. If anyone has any ideas please share. Thanks.