Menu

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

How to Replace Serpentine Belt Tensioner and Pulley 2003-06 GMC Yukon

Share on:

Remove the negative terminal from the battery. Just use a 8-millimeter wrench and just slide that out of the way. Take this cover off. Just use a 8-millimeter socket. Remove this bolt. Just pull the cover up and slide forward. Loosen up this one clamp right here. Use a straight blade screwdriver. Loosen this clamp as well. Take this hose bracket off of the intake. Just use a trim tool. Pop this off, just like that. Grab it right here, just rock it back and forth, sliding it forward. And also right here. Pop it off and pull it up.

Now, you're going to use a serpentine belt tool. We're going to use the 15-millimeter adapter on the end of it. If you don't have one, you can just use a 15-millimeter wrench. Just be careful. Loosen up the tension on it as if you're turning it clockwise. And then over on the idler, just take the belt off. Release the tensioner. Pull off your tool. Now, just take the belt off. I'm just going to take it off the harmonic balancer or the crank pulley, slide it off the tensioner. Slide it over the water pump, just to keep it out the way. If you're just doing the AC belt down below, you can just leave the belt off at this point, you wouldn't have to take it off all the way. If you're replacing it, take it off the alternator, off the power steering pump, and the idler pulley.

Now, we'll take the tensioner off. Use a 15-millimeter socket. There's three bolts in the front. Now, the bottom one's a shorter one, and the top two ones are longer. And be careful with the fan. You don't want to crack the fan if you're using a air ratchet or an electric ratchet. And pull that out. To take the idler pulley off, I'm going to use a 15-millimeter socket. And slide it out. Take the new tensioner pulley. Get the bolt started. Now, we can torque these to 37 foot-pounds. Take the new idler, get it in position and then tighten it up. Now, we'll torque this bolt to 37 foot-pounds.

All right, take the serpentine belt, and then go around the crank pulley down below, and then come up. Take one side of the belt, just go over the tensioner pulley. The other side goes on the backside, goes over the water pump, and then you're going to go down around the power steering pump pulley, and then up to the alternator. Take your belt tensioner tool. Carefully, while you're holding the belt near the idler pulley over here, take the tension off of the tool, the tensioner, and slide it under the idler. Just double-check. Make sure the belt is over all the pulleys. It looks good. Take the tool off. Should be good.

Now take the snorkel, line it up. Put it on the throttle body. And then over here on the airbox or over the mass airflow sensor, hook this holder on, just like that. A straight blade screwdriver, tighten up the worm clamp. Snug that up, and tighten this one up. Very good. Slide the cover in position, and tighten down the bolt. Take the negative terminal, connect it to the battery. Use a 8-millimeter wrench and tighten it up. Just make sure it's not...won't wiggle loose. Looks good.

2006 - 2006  GMC  Yukon
2006 - 2006  GMC  Yukon XL 1500
2005 - 2007  Hummer  H2
2003 - 2003  Chevrolet  Silverado 1500
2006 - 2006  Chevrolet  Suburban 1500
2006 - 2006  Chevrolet  Tahoe
2002 - 2002  GMC  Sierra 1500
2003 - 2008  GMC  Savana 2500 Van
2006 - 2006  Cadillac  Escalade ESV
2006 - 2006  Cadillac  Escalade EXT
2002 - 2002  Chevrolet  Silverado 1500
2003 - 2005  GMC  Savana 2500 Van
2003 - 2008  GMC  Savana 3500 Van
2003 - 2006  GMC  Sierra 1500
2003 - 2004  GMC  Sierra 1500
2007 - 2007  GMC  Sierra 1500 Classic
2006 - 2006  Cadillac  Escalade
2003 - 2006  GMC  Yukon
2003 - 2006  GMC  Yukon XL 1500
2003 - 2006  GMC  Yukon XL 2500
2003 - 2004  Hummer  H2
2003 - 2006  GMC  Sierra 2500 HD
2007 - 2007  GMC  Sierra 2500 HD Classic
2003 - 2006  GMC  Sierra 3500
2007 - 2007  GMC  Sierra 3500 Classic
2003 - 2006  Chevrolet  Silverado 1500
2007 - 2007  Chevrolet  Silverado 1500 Classic
2003 - 2005  Chevrolet  Express 2500 Van
2003 - 2008  Chevrolet  Express 2500 Van
2003 - 2008  Chevrolet  Express 3500 Van
2007 - 2007  Chevrolet  Silverado 1500 HD Classic
2003 - 2004  Chevrolet  Silverado 2500
2003 - 2006  Chevrolet  Silverado 2500 HD
2007 - 2007  Chevrolet  Silverado 2500 HD Classic
2003 - 2006  Chevrolet  Silverado 3500
2007 - 2007  Chevrolet  Silverado 3500 Classic
2003 - 2006  Chevrolet  Suburban 1500
2003 - 2006  Chevrolet  Suburban 2500
2003 - 2003  Chevrolet  Silverado 1500 HD
2005 - 2006  Chevrolet  Silverado 1500 HD
2003 - 2003  GMC  Sierra 1500 HD
2005 - 2006  GMC  Sierra 1500 HD
2007 - 2007  GMC  Sierra 1500 HD Classic
2003 - 2004  GMC  Sierra 2500
2003 - 2006  Chevrolet  Tahoe
2003 - 2008  GMC  Savana 1500 Van
2003 - 2006  Cadillac  Escalade
2003 - 2006  Cadillac  Escalade ESV
2003 - 2006  Cadillac  Escalade EXT
2003 - 2006  Chevrolet  Avalanche 1500
2003 - 2008  Chevrolet  Express 1500 Van
2005 - 2005  GMC  Sierra 1500
2006 - 2006  GMC  Sierra 1500
2004 - 2006  Chevrolet  Silverado 1500

Brakes too Sticky or Not Working on your Truck?

Brakes too Sticky or Not Working on your Truck?

If your brakes are stuck or smoking, the 1A Auto mechanics in this video will explain a few different causes on these trucks and how you can fix it

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...