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Summary
  • When the engine runs, the idler pulley is responsible for tensioning the drive belts, providing power to crucial components throughout the engine.
  • The idler pulley is on the front of the engine alongside the accessory belt. Because the pulley is responsible for moving the belt to power the AC, the fan, and the alternator, you can expect to find it near those parts.
  • Accessing the idler pulley is deceptively tricky and you’ll need tools like a socket set and a torque wrench.

Q: Where is the Idler Pulley Typically Located?

A: The idler pulley is one of the pulleys around which the accessory drive belt is routed. You can take a good look at the pulleys to find the idler pulley. It’s the one that isn’t used to adjust the belt, and it’s ordinarily smooth so that the back of the belt passes over it.

The best way to determine the exact location of your idler pulley is to check your vehicle owner’s manual because its location varies from model to model.

When the engine runs, the idler pulley is responsible for tensioning the drive belts, providing power to crucial components throughout the engine.

diagram showing the idler pulley location
Diagram showing the idler pulley’s location | Image Source: Richard McCuistian

Tips on How to Access the Idler Pulley

Accessing the idler pulley can be deceptively tricky and you’ll need tools like a socket set and a torque wrench. It varies though, and on some engines it’s very easy but the belt needs to be removed first.

You may need to deactivate and disconnect the battery to avoid issues while tinkering with your ride. Usually you won’t need to do this though, unless you’re removing the alternator.

Once the battery is disconnected, you can open the hood of your vehicle and remove the drive belt. Before removing the drive belt, make sure to remove the bolt attaching the belt to the alternator. Relieve any tension to make the belt easier to remove.

After the drive belt has been removed, you can freely access the idler pulley for inspection, repairs, or replacement.

, Where is the Idler Pulley Located?

Pro Tips are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.

Pro Tip: Spin the idler pulley by hand to listen for a bad bearing and feel to see if it is loose laterally.

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Technical Reviewer at CarParts.com

Richard McCuistian has worked for nearly 50 years in the automotive field as a professional technician, an instructor, and a freelance automotive writer for Motor Age, ACtion magazine, Power Stroke Registry, and others. Richard is ASE certified for more than 30 years in 10 categories, including L1 Advanced Engine Performance and Light Vehicle Diesel.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

File Under : Engine , DIY Tagged With : ,
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