Serpentine Belt Tensioner

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Part Details

  • Includes:   Pulley

This replacement serpentine belt tensioner is just what you need to get your vehicle in good working order again! If you are hearing a whirring noise from the front of your engine or if your belt often screeches you may be in need of a new belt tensioner. This part commonly wears out between 60,000 and 70,000 Miles. If it fails suddenly it can leave you stranded.


  • Brand New Serpentine Belt Tensioner
  • Includes pulley
  • Replaces dealer part numbers: 12573024, 24576885, 8125730240
  • Direct replacement
  • Built to strict quality control standards

This tensioner makes a great replacement and has good cost savings over a dealer unit.

Item Condition: New

Attention California Customers:

WARNING: Cancer and Reproductive Harm -

Lifetime Warranty

This item is backed by our limited lifetime warranty. In the event this item should fail due to manufacturing defects during intended use, we will replace the part free of charge.

  1. step : Removing the Serpentine Belt (0:54)
    • Insert the 3/8 inch drive ratchet into the tensioner
    • Turn the tensioner clockwise to loosen the belt
    • Pull the belt off by hand
    • Release the tensioner
  2. step : Removing the Belt Tensioner (2:23)
    • Remove the 15mm bolt from the tensioner
    • Pull off the tensioner
  3. step : Installing the Belt Tensioner (3:03)
    • Thread a 15mm bolt through the tensioner
    • Put the tensioner into place using the locating tab
    • Tighten the 15mm bolt to 35 - 40 foot-pounds of torque
  4. step : Installing the Belt (4:27)
    • Familiarize yourself with the belt routing diagram
    • Thread the belt past the tensioner
    • Loop the belt around the crank pulley
    • Bring it around the fan pulley
    • Bring it around the A/C Pulley
    • Bring it around the idler pulley
    • Bring it around the idler pulley
    • Insert the 3/8 inch drive ratchet into the tensioner
    • Pull the tensioner clockwise with the 3/8 inch ratchet
    • Pull the belt tight over the power steering pulley
    • Release the tensioner
    • Check that the belt is routed correctly

Tools needed for replacement:

    Ratchets & Related

  • 3/8 Inch Drive Ratchet
  • A Piece of Pipe (for leverage)
  • Ratchet
  • Swivel
  • Torque Wrench

  • Sockets - Metric

  • 15mm Socket

  • Wrenches - Metric

  • 15mm Wrench

4.70/ 5.0
10 reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Wrong Belt
the belt was too big, it makes a lot of noises.. I had to order another from GM
January 22, 2017
Going strong
I replaced this tensioner and the serpentine belt 10,000 miles ago and both are doing fine. Good quality for the price.
January 12, 2018
Very Pleased
I am impressed with the timely manner the price and when I received the part I will be ordering from here again. Steve
April 15, 2018
Quick ship. Easy installation thanks to the video! Fits perfect and took care of that annoying Noise under the hood. THANKS.
April 21, 2018
Hummer H3 serpentine belt idler.
The shopping experience was simple, helpful, and intuitive. The part was exactly as it was depicted on the site. It arrived on time, functions perfectly, and was a good price. Ill be back for my next DIY project!
October 31, 2018
For my 05 chevy
Great product, quality is good. Happy with A1 auto parts.
December 25, 2018
Excellent high quality parts that fit perfect and leaving you with more cash in your wallet
hi my name is Jim. Ive been fixing cars for more than 35 years I have a 2005 GMC envoy XL all the parts that Ive been ordering from this company work great. anything you need for your vehicle I definitely recommend you ordering it from here. you wont be disappointed. my truck runs and drives great. and I will always purchase my parts from this company. ????
February 16, 2019
Parts for both of my 2004 Chevy Trailblazer
Ordered my parts from 1A Auto and they showed up promptly 3 days later. The belt tensioner and pulley fit perfect. Very happy with this purchase.
March 24, 2019
Tensioner fits perfect in my vehicle. Even if I had to wait more than 2 weeks to get it, it came within the delivery date.
March 29, 2019
Very good service!
May 14, 2019
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Fits the following Makes:

Year Make Model Description
2004-2007Buick Rainier Buick Rainier L6 4.2L Serpentine Belt Tensioner
2004-2006Chevy Colorado Chevy Colorado Serpentine Belt Tensioner
2007-2012Chevy Colorado Chevy Colorado L5 3.7L Serpentine Belt Tensioner
2007-2012Chevy Colorado Chevy Colorado L4 2.9L Serpentine Belt Tensioner
2002-2009Chevy Trailblazer Chevy Trailblazer L6 4.2L Serpentine Belt Tensioner
2004-2006GMC Canyon GMC Canyon Serpentine Belt Tensioner
2007-2012GMC Canyon GMC Canyon L5 3.7L Serpentine Belt Tensioner
2007-2012GMC Canyon GMC Canyon L4 2.9L Serpentine Belt Tensioner
2002-2009GMC Envoy GMC Envoy L6 4.2L Serpentine Belt Tensioner
2006Hummer H3 Hummer H3 L5 3.5L Serpentine Belt Tensioner
2007-2010Hummer H3 Hummer H3 L5 3.7L Serpentine Belt Tensioner
2009-2010Hummer H3T Hummer H3T L5 3.7L Serpentine Belt Tensioner
2003-2008Isuzu Ascender Isuzu Ascender L6 4.2L Serpentine Belt Tensioner
2006Isuzu i-280 Isuzu i-280 Serpentine Belt Tensioner
2007-2008Isuzu i-290 Isuzu i-290 Serpentine Belt Tensioner
2006Isuzu i-350 Isuzu i-350 Serpentine Belt Tensioner
2007-2008Isuzu i-370 Isuzu i-370 Serpentine Belt Tensioner
2002-2004Oldsmobile Bravada Olds Bravada Serpentine Belt Tensioner
2005-2009Saab 9-7X Saab 9-7X L6 4.2L Serpentine Belt Tensioner
Part 1AEBT00069
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