ACDelco 12596250 Accessory Drive Belt Tensioner Assembly

Accessory Drive Belt Tensioner Assembly

Fits: 05-08 Pontiac Grand Prix, 06-09 Chevrolet Impala, 06-07 Chevrolet Monte Carlo, 08-09 Buick Allure, 08-09 Buick LaCrosse

Out of stock
ACDelco GM Original Equipment Drive Belt Tensioner Assemblies are spring-loaded pulleys designed to draw tension on your vehicle's serpentine belt, and are GM-recommended replacements for your vehicle's original components. These original equipment drive belt tensioner assemblies have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors. ? WARNING: Cancer and Reproductive Harm -



  • Buick;Chevrolet;Pontiac
  • GM-recommended replacement part for your GM vehicle's original factory component
  • Helps keep drive belt at correct tension to help maintain proper function
  • Manufactured to GM OE specification for fit, form, and function
  • Offering the quality, reliability, and durability of GM OE


Belt TypeSerpentine
Degree Range Of Adjustment (deg)30
FAQ - Answer 1Yes. If the drive belt is too tight, damage to other drive components may occur.
FAQ - Question 1Can a drive belt be too tight?
Good Maintenance Practices - Section 1 - Bullet 1Before purchasing and installing a drive belt tensioner assembly, make sure it is the correct size and fit for your vehicle.
Good Maintenance Practices - Section 1 - Bullet 2Be sure to have the replacement tensioner properly aligned to the other drive component pulleys.
Good Maintenance Practices - Section 1 - Bullet 3Have your vehicle inspected as soon as possible if the 'Service Engine Soon' light illuminates.
Good Maintenance Practices - Section 1 - Bullet 4Have your vehicle inspected immediately if the 'Service Engine Soon' light flashes rapidly, as this could indicate an engine misfire condition which may damage your engine and/or engine emission components.
Good Maintenance Practices - Section 1 - Bullet 5Regularly inspect assembly for signs of damage or wear, and replace them if signs of damage are found.
Height (in)5.25
Mount Hole Diameter (in)0.443 in
Mount Hole Diameter (mm)11.25 mm
Mount Hole Quantity2
Programming RequiredNo
Pulley Center Bore Diameter (in)0.394 in
Pulley Center Bore Diameter (mm)10 mm
Pulley Outside Diameter (in)2.6
Pulley Width (in)1.031 in
Pulley Width (mm)26.2 mm
Weight (lb)2.06



  • 2006-2007 Chevrolet Monte Carlo
  • 2008-2009 Buick LaCrosse
  • 2005-2008 Pontiac Grand Prix
  • 2008-2009 Buick Allure
  • 2006-2009 Chevrolet Impala
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