In my 2006 Chevy Cobalt 2.2liter Ecotech, the serpentine belt broke. I went out and bought a new one and didn't check the pulleys prior to putting the new one on. I haven't changed the belt before and just assumed it finally failed.

After installing the new one, turning on the car caused the car to stall after a few secs. I turned the car on again and keep the engine RPMs up to keep it running to inspect the belt and noticed the belt had a little wobble in it and it started to smoke around the AC Pulley.

Does it sound like it is a seized up pulley and if so, what are some solutions to fix it. I am having the hardest time finding anything outside of just changing the whole compressor to get the car back up and running.

Thank you for any help/insight you can give.

  • Welcome to Motor Vehicle Maintenance & Repair! Since your AC compressor has a clutch, even if the clutch has seized up, the compressore should still be able to go around. It sounds like to me the entire compressor has seized and therefore I'd bet it will need replaced. – Pᴀᴜʟsᴛᴇʀ2 Sep 8 '18 at 18:21
  • Can you rotate the clutch hub (the front part of the compressor pulley) with your hands (engine off and key in pocket obv)? If it's rotating (it should be a smooth rotation with uniform resistance on one whole turn), only the pulley bearing is at fault. If it's not rotating, the entire compressor has seized and it could have taken the pulley bearing with it. Either way, if the pulley bearing is shot unplugging the clutch coil terminal won't be a solution, the bearing has to be replaced. If it's healthy, unplugging the coil terminal is enough. Do that check, and let us know. – Al_ Sep 9 '18 at 10:53
  • Thank you so much for all the replies. I do not have to tools/jack needed to manually check the pulley system as you said @Al_ but I did do a little check myself. – Attackruby Sep 9 '18 at 18:25
  • I went out and turned the key over to power the car up and turned the AC button off. By doing this i was thinking it would deactivate the clutch and let the pulley be standalone. – Attackruby Sep 9 '18 at 18:25
  • I turned the car on and listened to it and had no drops in RPMs. As soon as i turned the AC on it goes to stall like before. So i turned off the AC again and things went back to normal. I went out and opened the hood to check the pulley/belt system and everything seems okay except the (ac)pulley does make a little noise. It does sound like the bearing is on its last leg. I let the car ideal for 20mins with no problems. Reving it up to about 2k RPMs at random intervals without any issues (outside of bearing sounding a little bad). – Attackruby Sep 9 '18 at 18:25

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