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How do you Change, Replace, or Install Broken 2002-2009 Chevrolet Trailblazer Engine Idler Pulley Replacement

Fits Years: 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009


Tools required:

  • 3/8 drive ratchet

  • 15mm socket/ratchet


Step 1: Open the vehicle's hood.

NOTE: We recommend accessing a diagram of the belt routing before beginning this installation. Many vehicles have it posted near the radiator, while others will have it in the manual.

Step 2: Using the 3/8 drive ratchet handle, insert the square tab into the opening on the tensioner pulley. Turn it CLOCKWISE to release the tension on the belt.

Step 3: You can now slide the serpentine belt from the vehicle.

Step 4: Loosen and remove the 15mm bolt (1) that secures the idler pulley to the vehicle.


This bolt is located BELOW the alternator's position.

Step 5: You can now remove the idler pulley from the vehicle.

Step 6: Insert the washer into the NEW idler pulley, and mount it by tighten the 15mm bolt (1).

Step 7: Route the belt per the routing diagram, and using the 3/8 drive ratchet handle, tighten the tensioner until the belt it taut.


NOTE: The belt should be taut, but not stretched or overly tight.



These Part Change / Installation Instructions Apply to
09 2009, 08 2008, 07 2007, 06 2006, 05 2005, 04 2004, 03 2003, 02 2002 Chevrolet Trailblazer Engine Idler Pulley Replacement Instructions
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