How To Replace Serpentine Belt Tensioner 99-04 GMC Sierra 2500
Difficulty: Intermediate · About 35 min · Gmc Sierra
Replace the serpentine belt tensioner pulley on a 1999-2004 GMC Sierra 2500.
Tools you will need
- Socket extensions
- Flat blade screwdriver
- Phillips head screwdriver
- 15mm socket
- Ratchet
- Torque wrench
Parts and supplies
- Serpentine belt tensioner pulley
Steps
- Remove the intake hose
Pry back its clip with a screwdriver to break the seal, then move it out of the way.
- Remove the old belt
Use a 15mm socket on the tensioner to relieve tension, then pull the belt off.
- Swap the tensioner pulley and reinstall the belt
Check the remaining pulleys for play or noise, unbolt the old pulley's 15mm bolts, bolt on the new one and torque it to about 30-35 ft-lb, then follow the belt diagram and relieve the tensioner again to walk the belt onto the last pulley.
Check your vehicle’s repair manual for exact specifications and fit.