i think that is the tension part of the tensioner it's not a clear picture of what it actually is so i'm guessing. it probably willmake some noise because the belt has a larger load put on it when the a/c goes on. it's recommended to replace belt and tensioner at 60,000 miles.

Answered by hmac300 (expert)
17,780 answers provided

the sound is from the silver circular area not the black one.the two rings of silver area rotate in each other cousing the click on acceleration and on TURN ON AC just one click

Response from bebobebo
10 questions asked

what you have pictured here is the tensioner for the belt. have the blet checked tosee if it's worn if it is then ithe tensioner should be replaced with the belt

Answered by hmac300 (expert)
17,780 answers provided

the belt is ok.
the click is not always happed on acceleration ,i noticde it more when car is not cold (i mean when i drive the car for at least 15 min?

Response from bebobebo
10 questions asked

well the belt is an edm type and they can look ok then break i just gave you recommended replacements it's up to you whether or not you want to do it. if it doesn't really bother you then stay with it.

Answered by hmac300 (expert)
17,780 answers provided