brought to you by 1a auto calm your source for quality replacement parts and the best service on the Internet in this video we show you how to replace the serpentine belt on this 2002 trailblazer this vehicle has the inline six 4.2 liter engine same as most Trailblazers on voice ascenders Rainiers and bravados only tool you'll need is a ratchet handle with a 3/8 drive okay right down here is your belt tensioner and you can get a 3/8 ratchet or flex handle right into this hole here take my handle push it clockwise and I'm gonna grab my belt okay just a quick freezing action if you did need some more leverage on that handle just use a piece of pipe put it right on to the handle and that gives you some extra leverage and moves that tension or easier slip it off my power steering pump and then slowly let my handle back okay now I can pull my belt off my alternator off the idler off the AC compressor way down underneath okay around the water pump and then off of the crank mellow it out and 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 and I didn't find one on or in the engine compartment of this truck so what you can see is basically going to put a big loop down around the crank which is the largest pulley down at the bottom the engine run it up over the water pump then down around the AC and then pull it up through or by the idler pulley and then loop it over to the power steering pump and the tensioner and the last thing you'll put it on actually is the alternator okay you Baltimore the auto stretch out a little bit here and take it and put a loop down see this will just kind of pull it out to the loop down around your crankshaft back up around your water pump here and then down okay over your idler way down and you just take it put a loop push a loop down underneath your AC compressor which is the smaller pulley way down at the bottom and pull that kind of around and comes back up and to the left side of your eye the pulley okay so we've got get 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 and then it's over here around the power steering pulley as well okay so now we're going to put our handle back into the tensioner okay pull pull it all the way both hands hold down my left I'll take the belt and put it onto the alternator with my right make sure it's on the idler pulley and then slowly release handle puts tension okay 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 ww1 ayato comm your source for quality replacement parts and the best service on the internet please feel free to call us toll-free 888 eight four four three three nine three where the company that's here for you on the internet and in person