Squealing fan belt? Here's how to find out when it needs to be replaced

The fan belt, otherwise known as a serpentine belt, as well as other components like shock absorbers and engine mounts, are typically unsung heroes working in the background.

Like the aforementioned components, one will need to replace the fan belt when the time comes. Question is, when is the right time to replace the fan belt?

1. Squealing noise from the engine bay

The most obvious sign is a loud squealing noise from the engine bay when your engine is running. This is caused by the belt slipping on the pulley.

If you notice a loud squealing noise emitting from the engine bay of your car, it’s best to drive to your nearest mechanic to have it diagnosed. If left unchecked, the fan belt could potentially snap, leaving you stranded.

2. When there’s cracks or missing chunks underneath the belt

Another tell-tale sign is to check the underside of the belt to see if there are cracks or missing chunks.

Considering that the belt is constructed out of reinforced rubber, a cracked belt is a sign that you should have it replaced soonest possible.

This is why it’s generally a good idea to perform periodic inspection on your car. If caught early, having it fixed will save you tons of headache in the long run.

3. Hot air blowing from your air-conditioning vents

No, that’s not your heater at work, but rather another sign of a failing fan belt. Seeing that the fan belt is connected between the engine and air-conditioning pump, a failing belt would potentially cause the air-conditioning system to perform less efficiently.

In cars with hydraulic power steering, a worn fan belt could also cause the steering to weight up considerably more, as the belt is also connected to the hydraulic power steering pump.

4. Engine overheating

This is the worst case scenario, as the fan belt can potentially cause an overheating problem. This belt is connected to your water pump and a failing fan belt can cause the water pump to not run, resulting in an overheating engine.

If you notice that your car is overheating, it’s best to stop at the side of the road and call a mechanic. Do not attempt to drive any further as it can potentially aggravate the situation.

Generally speaking, fan belts are not included in a vehicle's maintenance schedule, so it is up to you, the driver, to perform periodic inspection on these consumable parts. 

There you have it, four signs that you need to have your fan belt replaced. So the next time you heard unusual noises coming from your engine bay, you’ll have a better idea of what could be wrong.