Step 2: Insert the 3/8 drive ratchet handle into the belt tensioner. Turn the tensioner CLOCKWISE (while FACING the engine) to release the tension on the serpentine belt.
Step 3: Loosen and remove the 15mm bolt (1) that secures the belt tensioner to the assembly. You can now slide and remove the belt tensioner.
Step 4: Mount the new belt tensioner to the vehicle by tightening the 15mm bolt (1).
Step 5: Using the routing diagram posted near the radiator, route the serpentine belt around the proper pulleys. You can now insert the 3/8 drive ratchet into the tensioner and turn it COUNTER CLOCKWISE to increase the tension on the belt.
NOTE: Do not over-tighten the belt! It should be taut, but not stretched or overly tight!
These Part Change / Installation Instructions Apply to
06 2006, 05 2005, 04 2004, 03 2003, 02 2002, 01 2001, 00 2000, 99 1999 Chevrolet Silverado, GMC Sierra Serpentine Belt Tensioner Replacement Instructions