2012 Buick Lacrosse Serpentine Belt Diagram (2024)

FAQs

How do you find a serpentine belt routing diagram? ›

Some vehicles have the serpentine belt diagram located on a decal somewhere in the engine compartment. But if your car does not have a decal, you can easily look up the diagram in a repair manual or repair database. Another option is to take a photo of the old belt before removal.

To replace the Serpentine Belt on this vehicle will require the use of a special tool: Hydraulic Belt Tensioner Compressor.

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.

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.

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.

Standard specifications indicated on V-belts

Featured on classic V-belts are markings, i.e. profile and number, which stands for the inner length, given in inches. This is followed by a number representing millimetres, Li, which stands for the inner length.

WHAT DOES A SERPENTINE BELT DO? The serpentine belt is one long, snaking belt that is designed to keep your alternator, power steering pump, air conditioning, and, in some cases, your water pump running smoothly and effectively.

As we mentioned early, a serpentine belt delivers power to your alternator, power steering pump, and air conditioning compressor. In some cases, it also supplies power to your water pump.

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.

We suggest technicians change a pulley whenever a timing belt or serpentine belt is changed and vice versa, but there are eight key warning signs to look out for when a pulley goes bad: Rock – Rock the pulley back and forth. There should be no movement or play from side to side.

How do you check belt tension and pulley alignment? ›

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.

What Is the Ribbed Belt Profile and Number of Ribs? Ribbed belts have lengthwise grooves on the inside. Measure the pitch of the groove, i.e. distance between projections, e.g. 3.54 mm = belt type PK. Count the number of grooves, i.e. the number of projections - e.g. 7, as shown in the picture.