When you first start the car the pulley free wheels. If you watch it you will see it's rotating slower than anything else thats spinning. You can stop it with your hand if your brave (or foolish) enough. I was. Mine doesn't chirp and engages transparently. The clearances on the Code 3 pulleys were all over the place. Lots of buyers were concerned and some returned them if memory serves me correctly. You can find lots of threads with people asking for shims. When I got mine, (new) I was unhappy and almost returned it. But I decided to try it first and after 2 years, more or less, it's still on. I have a loud bearing noise but it's one of the fans. I have no grinding noises from the Code 3. If you decide to try stopping the pulley after start up (out of curiosity) please don't use your hand. It doesn't take much pressure to stop it from free wheeling so use a rubber mallet or leather something or other. I refuse to divulge why I stopped it in the first place.

Les