Keep your serpentine belt tracking true and every accessory spinning with the Dayco Accessory Drive Belt Idler / Tensioner Pulley (MPN 89058). This steel pulley rides on the main accessory drive, guiding the belt along its path and helping maintain proper tension so it stays seated. It installs as a direct-fit replacement for the listed applications, including the 2004-2012 Chevrolet Colorado and GMC Canyon, 2006-2010 Hummer H3, 2009-2010 Hummer H3T, 2003 Toyota MR2 Spyder, and heavy-truck models — see the Buyer's Guide tab for the full list.
Dayco classifies this as a light-duty idler/tensioner pulley. Signs it may need replacing include chirping, squealing, or grinding from the belt drive or a visibly wobbling pulley; if a worn pulley bearing is the cause, replacing it addresses the noise. Sold individually — some applications (such as the Freightliner Cascadia and Western Star 4900SA) use two, so check the quantity for your vehicle.
Interchange: 36301 · 580211 · 49180 · 900489A · 900489
Manufacturer part number 89058
This part cross-references / interchanges with the following part numbers:
What does this pulley do?
It works as both an idler and tensioner pulley on the main accessory drive — guiding the serpentine belt along its path and helping maintain proper tension so the belt stays seated.
How do I know if it needs replacing?
Chirping, squealing, or grinding noise from the belt drive, or a visibly wobbling pulley, can be signs of a worn bearing. Diagnose the source before replacing.
Will it fit my vehicle?
It's a direct-fit replacement for the listed applications, including the 2004-2012 Chevrolet Colorado and GMC Canyon, 2006-2010 Hummer H3, and 2003 Toyota MR2 Spyder. See the Buyer's Guide tab for the full list.
How many do I need?
The part is sold individually. Most listed applications use one, but some (such as the Freightliner Cascadia and Western Star 4900SA) use two — check the quantity for your vehicle.
What belt does it work with?
The pulley has a flat profile sized for a 6-rib serpentine belt, with a 70 mm outside diameter and 30 mm width.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
