How to Replace AC Belt and Tensioner 2000-08 GMC Yukon

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. You can just use a 8-millimeter socket. Remove this bolt. Just pull the cover up and slide forward. Loosen up this worm 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 and 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 gonna use a serpentine belt tool. We're gonna 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. Take the belt off. I'm just gonna take it off the harmonic balancer with a crank pulley. Slide it off the tensioner. Slide it over the water pump just to keep it out of 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.

Take this shield off. There's a bolt there, bolt there, there. Sometimes there's three bolts here. Sometimes just two. Use a 15-millimeter socket. And take the cover down. Now the belt has broken on this vehicle so I don't have a belt on here but if you needed to remove the belt first, just use a 3/8 drive ratchet and a extension and just go into the tensioner right here and then in clockwise motion, loosen up the tension on the belt. Slide the belt off. You're gonna take the belt off behind the harmonic balancer or the crank pulley and it loosen the tension up and just slide the belt all the way off. Now take a 15-millimeter socket. Remove the two bolts in the bottom of tensioner. And slide it out. Take the new tensioner and put it back in position. Take the bolts. Get the bolts started. And tighten the bolts down. And torque these bolts to 37 foot-pounds. Take the new belt. Go over the crank pulley. You're gonna go behind the crank pulley and then go over to the AC compressor, get it around the pulley and then around the tensioner pulley. All right. Once that's all lined up from there and take your socket and extension or ratchet and extension and pull the tension off the belt as you slide the belt on the rest of the crank pulley. Just make sure it's on there good, in all the grooves. And it looks good.

Take this cover, bolts lined up. And snug them all up. All right. Take the serpentine belt. I'm gonna go around the crank pulley down below and come up. Take one side of the belt. Just go over the tensioner pulley. The other side goes on...back side goes over the water pump and then you're gonna 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 the tool, the tensioner, and slide it onto the idler. Just double check, make sure the belt is up over all the pulleys. It looks good. Take tool off. Should be good. Take the snorkel, line it up. Put on the throttle body and then over here on the airbox or over the mass airflow sensor, hook this holder on just like that. Your 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 wiggle loose. Looks good.