Posted on 3/27/2026
Serpentine and timing belts both have the word belt in the name, so people lump them together. The reality is they do very different jobs, and the consequences of failure are not the same. One belt can leave you stranded quickly. The other can also leave you stranded, and on some engines it can create major internal damage. If you’re planning maintenance, understanding the difference helps you spend money in the right places. What A Serpentine Belt Does The serpentine belt is the external belt you can usually see when the hood is open. It wraps around pulleys and drives accessories. Depending on your engine design, it may drive the alternator, power steering pump, A/C compressor, and sometimes the water pump. Because it drives the alternator, a failed serpentine belt can quickly lead to a dead battery while driving. If it drives the water pump on your engine, it can also contribute to overheating. Many drivers first notice serpentine belt issues as squealing ... read more