Replacing Your Car’s Drive Belts

Replacing Your Car’s Drive Belts

Most drivers tend to think about their car’s parts in terms of mechanical or electrical components. That is, repairs are usually done to correct problems related to the alternator, intake valve, brakes, catalytic converter, and similar parts. But, your car also has drive belts under the hood. If the belts snap (and over time, belts usually snap), your car will break down. So, it’s important that car owners remember to have their drive belts replaced when they begin to wear. Below, I’ll describe the difference between the belts in older and newer cars, and when you should consider replacing them.

Older Cars Versus New Models

Your car’s drive belts control a lot of other components. There are typically two kinds: V-belts and serpentine belts. When they break, whatever part they control stops working. That can include the air conditioner, alternator, or water pump. When a V-belt breaks, there’s a good chance that your car will break down. When a serpentine belt breaks, your car will definitely break down.


Older cars usually have several belts. Each belt controls a specific part. One might run the air conditioner while another allows the alternator to produce a current. Still another will control the power steering. If one of those belts break, the specific part it’s attached to will no longer function. Newer cars are much different. They usually have one serpentine belt that controls everything. When it breaks, your entire car stops functioning.

How Long Do Drive Belts Last?

Under normal circumstances, a V-belt should last approximately 36,000 miles. A serpentine belt can last up to 50,000 miles. That said, the heat to which the belts are exposed can have a major affect on its life. When there’s a lot of heat generated over time, it can cause the rubber material to harden. When it hardens, it becomes more prone to accelerated wear and cracking. If the belt is loose (you’ll hear a strange screeching sound when you start the car or take sharp turns), the additional friction can add even more heat to the process. So, even though V-belts and serpentine belts are expected to last for 36,000 and 50,000 miles, respectively, you should inspect them before reaching that point.

When To Replace Them

If you look at a drive belt, you may notice small cracks have developed. That doesn’t mean you need to immediately replace the belt. They’re made from very sturdy material. Even with small cracks, they won’t typically break. However, keep in mind that the belts wear over time. Small cracks are one of the visible signs, so you should plan to replace it in the near future. The good news is that it’s easy to identify, and having a replacement installed will prevent your car from leaving you stranded.

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