2012 Buick Lacrosse Serpentine Belt Diagram (2024)

FAQs

How do you find a serpentine belt routing diagram? ›

Vehicle manufacturers produce serpentine belt diagrams that are designed to aid with this task. Some vehicles have the serpentine belt diagram located on a decal somewhere in the engine compartment.

Turn off the engine and remove the serpentine belt. Shake and spin each pulley to check if there is excessive play or noise. Any play or back-and-forth movement indicates a bad pulley bearing.

A: Commonly a belt routing diagram sticker is on the underside of the hood or in the engine compartment. If there is no diagram, make a sketch of the belt and pulleys before removing the belt. This will help you re-route the new belt correctly.

Check if the belt runs centrally on the pulleys. Any sideward movement or slippage can indicate misalignment. Straightedge or String Line: Place a straightedge or taut string along the faces of the pulleys to see if they line up perfectly. Any deviation from a straight line suggests angular or parallel misalignment.

One of the common bad idler pulley symptoms is when the engine belts start producing a squealing sound. When the pulley seizes, or the surface is worn-out, then there is a squealing noise as the engine belt rubs against its surface, due to the absence of enough motion from the pulley, a squealing sound is produced.

Visibly worn pulleys

Over time, the pulley and its various components will eventually start to show visible signs of wear, especially those pulleys in harsh environments. Things to check for include: Visible damage to the end plate, bearing housing, shaft and lagging.

The serpentine belt, a crucial component in modern vehicles, plays a vital role in powering various systems and accessories, such as the alternator, air conditioning, power steering, and more.

You can find the correct size of serpentine belt for your car in the owner's manual or by using an online belt sizing tool. If you are unsure about the size of the serpentine belt you need, it is best to consult a mechanic or an auto parts store.

If the belt is already out of place, locate the driver's manual or the under-the-hood placard, where you'll find a sketch of the routing.

When needing a replacement belt, performing an application lookup or cross-reference should always be done first, but when this returns no results, the PK number is all you need to determine a replacement size. EXAMPLE: 6PK1003 » 6 - This indicates the number of ribs on the belt; therefore, this is a 6-rib belt.