How to Replace Serpentine Belt Tensioner with Pulley 99-04 GMC Sierra 2500
Difficulty: Intermediate · About 60 min · Gmc Sierra
Replace the serpentine belt tensioner and pulley on a 1999-2004 GMC Sierra 2500.
Tools you will need
- Socket extensions
- Flat blade screwdriver
- 15mm socket
- 3/8 inch drive ratchet
Parts and supplies
- Serpentine belt tensioner
Steps
- Remove the old belt
Loosen the intake duct's hose clamp and remove the duct, release belt tension with a 15mm socket and ratchet on the tensioner, slip the belt off the idler pulley, remove the bottom shield, then slip the belt off the rest of the way.
- Replace the tensioner
Remove its two mounting bolts, remove the old tensioner, install the new one, then snug up the two bolts.
- Reinstall the belt
Feed it onto all the pulleys, tighten the A/C tensioner pulley with a ratchet and extension, refit the bottom shield, loosen the top tensioner with the 15mm socket to seat the belt, remove the socket, then refit the intake duct and tighten its clamp.
Check your vehicle’s repair manual for exact specifications and fit.