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2008 Chevy Trailblazer LT Belt Tensioner Replacement

My tensioner pulley went stiff and caused my alternator to fail, so do I have to replace both parts

The tensioner pulley has failed and should be replaced. And most likely you will need to also replace the serpentine belt that rides on that belt. As for the alternator, it would no longer spin because the belt is broken due to the tensioner locking up. So most likely the alternator is fine and should not need to be replaced.

DRIVE BELT TENSIONER PULLEY, REPLACE

REMOVAL

  1. Remove accessory drive belt.
  2. Remove drive belt tensioner bolts.
  3. Then Remove drive belt tensioner, Fig. 1.
    INSTALLATION
  4. Install drive belt tensioner, Fig. 1.
  5. Install drive belt tensioner bolts.
  6. Torque bolts to 37 ft. lbs.
  7. Install accessory drive belt.
Fig 1.