Menu

1A Auto Video Library
Our how-to videos have helped repair over 100 million vehicles

How to Replace Serpentine Belt Tensioner 96-99 GMC Sierra 5.7L

Share on:
  1. step : Removing the Serpentine Belt (0:48)
    • Familiarize yourself with the route of the serpentine belt
    • Insert the 3/8 inch drive ratchet into the tensioner
    • Turn the tensioner clockwise to loosen the belt
    • Pull the belt off the alternator
    • Release the tensioner
    • Pull the belt off by hand
  2. step : Removing the Serpentine Belt Tensioner Pulley (1:34)
    • Remove the 13mm bolt from the tensioner pulley
    • Pop the tensioner straight off of the front of the motor
  3. step : Installing the Serpentine Belt Tensioner Pulley (2:14)
    • Pop the tensioner into place
    • Tighten the 13mm bolt to the tensioner pulley
    • Torque the bolt to 37 foot-pounds
  4. step : Installing the Serpentine Belt (2:44)
    • Loop the belt around the crank pulley
    • Bring it around the water pump
    • Bring it under the power steering pulley
    • Bring it around the A/C Pulley
    • Bring it around the belt tensioner
    • Bring it under the idler pulley
    • Pull the tensioner clockwise with the 3/8 inch ratchet
    • Pull the belt over the alternator
    • Release the tensioner

Hi, I'm Mike from 1AAuto. We've been selling auto parts for over 30 years! We're dedicated to delivering quality auto parts, expert customer service, and fast and free shipping, all backed by our 100% satisfaction guarantee. So visit us at 1AAuto.com, your trusted source for quality auto parts.

In this video, we're going to be working with our 1996 GMC Sierra K1500. We're going to show you how to remove and replace your vehicle's serpentine belt tensioner on the 5.7-liter V8.

If you like this video, please click "subscribe". We have a ton more information on this truck, as well as many other makes and models. If you ever need parts for your car, you can follow the link down in the description over to 1AAuto.com.

Here are the items you will need for this repair: 8 to 13mm sockets, 3/8 ratchet, socket extension, 8 to 13mm wrenches, torque wrench


Be sure your vehicle has a belt path diagram somewhere on the cowl or under the hood before removing the belt. If it's missing or unclear, be sure to draw it somewhere under the hood or take a good picture. Put the 3/8 drive of a ratchet into the square on your serpentine belt tensioner and turn it counterclockwise to release tension. Then simply pull the belt off of any one of the pulleys, slowly release the tension from the tensioner. Remove your ratchet, and take the belt off of the pulleys.

Remove the 13mm bolt in the center of the pivot for your serpentine belt tensioner. Remove the bolt. Pop the tensioner off of the front of the motor. Be very careful not to twist when doing this. You saw I just grabbed the end of the pulley and popped out because that little aluminum stud there will get broken off in here and not allow the new tensioner to sit in place so you have to drill it and that just adds a lot of work.

There is nothing wrong with our tensioner so we'll just reinstall it. The process to install a new one is exactly the same. Simply line it up, drop it into place, and start your 13mm bolt. Get that in as far as you can by hand before tightening it down with your 13mm socket and ratchet and torquing it. Torque this bolt to 37 foot-pounds.

Hook the serpentine belt around the crank pulley or harmonic balancer from the passenger side. Be sure that it seats fully into the grooves of the pulley and doesn't lay over the edge on either side. Wrap the driver's side of the belt around the water pump, under the power steering pump on the other side, and up and over the AC compressor. I already have the left side wrapped around the tensioner here just because that's where it falls. Then, from over the AC compressor under the idler pulley, reinstall the ratchet into the tensioner. Turn the ratchet counterclockwise to release the tension, and install your belt over the alternator. Take a second just to look around and make sure that your belt is seated and routed properly before releasing the tension and removing your ratchet.

Thanks for watching. Visit us at 1AAuto.com for quality auto parts, fast and free shipping, and the best customer service in the industry.

Tools needed for replacement:

    Ratchets & Related

  • Torque Wrench
  • Socket Extensions
  • 3/8 Inch Drive Ratchet

  • Sockets - Metric

  • 13mm Socket

  • Wrenches - Metric

  • 13mm Wrench

1996 - 2000  Chevrolet  Express 3500 Van
1996 - 2002  Chevrolet  Express 1500 Van
1996 - 2002  Chevrolet  Express 2500 Van
1996 - 2002  Chevrolet  Express 3500 Van
1996 - 2013  Chevrolet  Express 1500 Van
1996 - 2005  GMC  Savana 2500 Van
1996 - 2000  GMC  Savana 3500 Van
1996 - 2002  GMC  Savana 2500 Van
1996 - 2002  GMC  Savana 1500 Van
1996 - 2013  GMC  Savana 1500 Van
1996 - 2002  GMC  Savana 3500 Van
1996 - 1999  GMC  C1500 Truck
1996 - 1999  GMC  K1500 Truck
1999 - 2013  GMC  Sierra 1500
2002 - 2005  Chevrolet  Astro
1996 - 2001  Chevrolet  Astro
1996 - 2004  Chevrolet  S10 Pickup
1996 - 2004  GMC  S-15 Sonoma
2002 - 2005  GMC  Safari
1996 - 2001  GMC  Safari
1996 - 2000  Chevrolet  Tahoe
1996 - 2001  Oldsmobile  Bravada
1997 - 2000  Isuzu  Hombre
1999 - 2000  Cadillac  Escalade
1996 - 2000  GMC  Yukon
1996 - 2000  GMC  K3500 Truck
1996 - 2000  GMC  K2500 Truck
1996 - 2000  GMC  C3500 Truck
1996 - 2000  Chevrolet  K2500 Truck
1996 - 2000  Chevrolet  K3500 Truck
1996 - 2000  GMC  C2500 Truck
1996 - 1997  Chevrolet  K3500 Truck
1996 - 1997  Chevrolet  C3500 Truck
1999 - 2013  Chevrolet  Silverado 1500
1996 - 1999  Chevrolet  K1500 Truck
1996 - 1999  Chevrolet  C1500 Truck
1996 - 2000  Chevrolet  C2500 Truck
1996 - 2000  Chevrolet  C3500 Truck
1996 - 1999  Chevrolet  Suburban C1500
1996 - 1999  Chevrolet  Suburban K1500
1996 - 1999  Chevrolet  Suburban C2500
1996 - 1999  Chevrolet  Suburban K2500
1996 - 1999  GMC  Suburban C1500
1996 - 1999  GMC  Suburban K1500
1996 - 1999  GMC  Suburban C2500
1996 - 1999  GMC  Suburban K2500
2007 - 2007  Chevrolet  Silverado 1500 Classic
2007 - 2007  GMC  Sierra 1500 Classic
1996 - 1999  Chevrolet  P30
1996 - 1999  GMC  P3500
1996 - 1996  GMC  G3500
1996 - 2002  Chevrolet  Blazer
2003 - 2005  Chevrolet  Blazer
1996 - 2001  GMC  Jimmy

Serpentine Belt Tensioner

Chevrolet GMC Cadillac Olds Isuzu Serpentine Belt Tensioner DIY Solutions

This part replaces:

  • Dorman 419-100
  • OE # 10239670 12456152 89017309
  • DIY Solutions BEP00007

Part Details

  • Includes: Pulley
Search Videos
Go To Top

Same Day Shipping

Orders ship same day when ordered by 2pm ET. Need your part faster? Choose expedited shipping at checkout.

Guaranteed To Fit

Providing you the highest quality, direct fit replacement auto parts enforced to the strictest product standards.

USA Customer Support

Exceeding customers' expectations every day, our team of passionate auto enthusiasts are here to help.

Instructional Video Library

Thousands of how-to auto repair videos specific to year, make and model guide you step-by-step through your repair.

Loading...