Brand new serpentine belt keeps coming off?

Tiny
PONDEE69
  • MEMBER
  • 2002 BUICK RENDEZVOUS
  • V6
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
The old serpentine belt frayed and came off. Put the new belt on and it came off a couple of times. What could be the problem?
Sunday, February 5th, 2023 AT 8:25 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Nine times out of ten it will be the serpentine belt tensioner you can tell if the belt is not riding in the center of the tensioner pulley. Here is how to change the part out in the images below. Also, once the belt is off, please check the two idler pulleys as shown below. The belt needs to ride in the center of all pulleys. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.
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Monday, February 6th, 2023 AT 12:27 PM

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