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.

EXAMPLE: 6PK1003 » 6 - This indicates the number of ribs on the belt; therefore, this is a 6-rib belt. » PK – The “P” indicates a metric designation, and the “K” indicates the belt is automotive per SAE J1459. » 1003 - This is the effective length of the belt expressed in millimeters.

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

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.

Most vehicles nowadays usually have a belt routing sticker located somewhere in the engine compartment, making it even easier.

The first digit indicates an eight-rib belt, followed by “P” to identify metric belt sizing, and a “K” showing that this belt conforms to the SAE standard for rib sizing (3.56 millimeters wide for automotive-type serpentine belts).

Step 1: Outside the surface of your belt, you will find the prefix e.g. B, 3L.. etc. This is also known as the belt profile. Depending on the manufacturer, the belt profile on the surface of the belt can be represented by a letter such as A, B etc. or an alphanumeric value, such as 3L, 4L etc.

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.

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.

What runs off the serpentine belt? ›

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.

Absolutely, if it is routed the wrong way it may not fit on or be to loose. Or worse you manage to get it to fit snug but have it on the wrong side of, say the water pump pulley, then the pump would be running backwards and would not move the coolant properly through the engine causing it to overheat.

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.