Belt Fan and Alternator.
Serpentine Belt.

• Transmits power through and to the alternator, power steering pump, and A/C compressor
• Also known as a fan or accessory belt
• Replace when cracked, frayed, peeling, or malfunctioning

Your INFINITI's motor depends on various complicated, interconnected components that support the signature INFINITI ride you know and love. Some Engine parts are linked by a series of belts, and the Serpentine Belt is among the most important ones.

Your INFINITI's Serpentine Belt is a strong, continuous belt that transfers power to the power steering pump, alternators, A/C compressors, and, in some models, water pump. Sometimes the Serpentine Belt is called an accessory belt because it powers your INFINITI's peripheral devices. However, that simple reference doesn't make it any less important.

INFINITI Serpentine Belts are typically made of reinforced rubber engineered to withstand the friction and heat of transferring power from one part of the engine to the next. But, like other car parts, Serpentine Belts are subject to wear and tear.

Serpentine Belts can tear or crack with age, or they can malfunction if they become soaked due to oil or coolant leaks. Also, they may lose tension, lack alignment, or slip due to faulty tensioning mechanisms, which may require replacing both the Serpentine Belt and the tensioner, or re-adjusting the belt, depending on its condition. A few signs that you might have Serpentine Belt problems include: weird rattling noises coming from the engine, a malfunctioning car A/C or loss of power steering functionality, engine sweltering, and visible signs of wear on the belt.

In general, your INFINITI's Serpentine Belt is supposed to last hundreds or thousands of miles, but its useful life can be shortened due to coolant leaks, oil leaks, and old tensioners. You should get your Serpentine Belt inspected when you change your oil, or get a professional inspection from an INFINITI service center in your area.

The required method for a Serpentine Belt replacement is dependent on the tensioner mechanism in your INFINITI. Consult with an expert technician or your INFINITI manual before DIY-ing any services!

Unsurprisingly, you'll need a Serpentine Belt that's designed-to-fit your model and year, and a specialized belt-tensioning tool. Remember that if your INFINITI has a manual or hydraulic Serpentine Belt tensioner, getting a Serpentine Belt replacement at an INFINITI service center near you is highly recommended.

When you're ready to get started, take pictures of the placement of your current Serpentine Belt and how it winds around your engine's components. Then, release the tensioner using a ratchet and delicately unwind the Serpentine Belt, taking care not to mess with any accessories.

Once you've removed the old Serpentine Belt, check it for signs of engine oil or coolant leaks, tears, and breakage to pinpoint issues that go beyond-the-belt! Thread the new Serpentine Belt back into place and release the tensioner, tightening it with a wrench. Lastly, crank the engine and allow it to idle while visually ensuring that the new belt runs smoothly.

Whether you choose to DIY your INFINITI Serpentine Belt replacement or get professional services from an INFINITI expert near you, having the right INFINITI part is essential. Buy an authentic Serpentine Belt replacement made-to-fit your INFINITI model and year directly from the manufacturer itself! Purchase a new INFINITI Serpentine Belt guaranteed to fit your INFINITI QX56 or INFINITI QX80. See the What This Fits tab for more details.