How to Replace Serpentine Belt 2002-09 Chevy Trailblazer

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In this video we show you how to replace the serpentine belt on this 2002 Trailblazer. This vehicle has the inline-6 4.2 liter engine same as most Trailblazers, Envoys, Ascenders, Rainiers, and Bravadas. The only tool you'll need is a ratchet handle with a 3/8 inch drive.

Right down in here is your belt tensioner. We can get a 3/8 ratchet or flex handle right into this hole here. Take the handle and push it clockwise. I'm going to grab my belt. Okay just a quick freeze in the action. If you did need some more leverage on that handle, just use a piece a pipe, put it right onto the handle and that gives you some extra leverage and moves that tensioner easier. Slip it off the power steering pump. Then slowly let my handle back. I'm going to pull my belt off my alternator, off the idler, off the AC compressor way down underneath, up around the water pump, and then off of the crank down low. The belt's out.

Here's my artist's rendition of the belt diagram. This is very important because these belts can be a little confusing to put back on. I didn't find one in the engine compartment of this truck. What you can see is basically you're going to put a big loop down around the crank which is the largest pulley down at the bottom of the engine. Run it up over the water pump , then down around the AC. Then pull it up by the idler pulley and then loop it over to the power steering pump, and the tensioner. The last thing you'll put it on, actually, is the alternator.

Here's the new belt from 1A Auto. Stretch it out a little bit here. Take it and put a loop down here. You can't see this, but I'll just call it out. Put a loop down around your crank shaft. It comes back up around your water pump here, then down over your idler way down until you just take it, push a loop down underneath your AC compressor which is the smaller pulley way down at the bottom. Pull that around until it comes back up to the left side of your idler pulley. We've got it down around the crank. It comes back up and around the water pump. Then goes down around the AC compressor way down there, back up around here. It's not on the alternator yet. Then it's over here around the power steering pulley as well. Now we're going to put our handle back in the tensioner. Pull it all the way with both hands. Hold it down with my left while I take the belt and put it on the alternator with my right. Make sure it's on my idler puller. Then slowly release the handle which puts tension on the belt. Now we can see it's around my power steering, down around the tensioner, around the crank, up around the water pump, down around the AC, up by the idler, and the alternator.

We hope this helps you out. Brought to you by www.1AAuto.com, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.