How to Replace Serpentine Belt 1999-2004 GMC Sierra 2500

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Hi I'm Mike Green. I'm one of the owners of 1A Auto. I want to help you save time and money repairing and maintaining your vehicle. I'm going to use my 20 plus years of experience restoring and repairing cars and trucks like this to show you the correct way to install parts from 1AAuto.com. The right parts installed correctly that's going to save you time and money. Thank you and enjoy the video.

In this video, we'll be showing you how to remove and replace the serpentine belt on this 2002 GMC Sierra process is the same for many '99 to '07 GMC and Chevy Trucks with the 4.8, 5.3 and 6.0 litre engine. Only tools you'll need are flat blade screw driver, and a 15 millimeter socket and ratchet.

First, you want to move your intake hose by removing or loosening two clamps, one there and one there. We're going kind of speed up through this part here. You need your screwdriver to kind of pry in and break the rubber loose from the plastic, maybe twist it a little bit as well, and then pull it from the throttle body. Also a little clip that holds the radiator hose in, pry that out with your screwdriver as well. Then I'll install it back on my intake hose. Make it easier for later.

Now you can see tension is right here, so what you're going to do is take a 15 millimeter socket and ratchet. Put the socket on there. Move the ratchet clockwise, and that takes the tension off. You can pull the belt either off your tensioner, or I'm actually over here pulling it off of the idler pulley in the middle. Then, slowly release this back. It's going to actually go back further than original point. Now get your wrench back off. Now your belt winds around all its pulleys and down around the crank pulley. Let's pull it off and pull it right up.

To put the belt back on what you want to find is your routing diagram. We're going to be using this one right here. The solid belt is the one that we're going to be looking at. What you're going to do is actually feed it down and around your crank pulley first, then up and over your water pump around your power steering. Then up in here and then you'll pull. What I usually do is pull on here, and then pull it up onto the alternator. Of course I can't really film it that well, so you have to take my word for it that, that's what I'm doing. I'm going to take the belt feed it down and make a loop. Make sure it goes all the way around the crank pulley, up over the water pump here, down and around the power steering pump.

First, I went down and around my crank pulley, up and around the water pump with the backside of the belt. Then around the power steering pump. Now I have this part that I can hold, to put onto the alternator and put it there for a second. Here's my socket and my 15 millimeter bolt on my tensioner. While I pull this way on the tensioner, take the belt and pull it up, and onto the alternator, and the tensioner took over, and I'm just going to push it on a little more to my idler pulley here. It's pretty well centered. After you have the belt on, just a quick check. Make sure it's on all the pulleys. Look way down at the crank pulley and make sure that it's on correctly down there. Also, obviously, over here, the alternator and the power steering pulley, everything looks good.

We're going to fast forward through the section, which is just putting that tube back in, basically, and push in the rubber on to the plastic, tightening up the clamps and reinstalling that little clip that held the radiator hose to it. After that, you should be pretty much all set.

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