Why does my serpentine belt squeal when AC is on?
A loud squeal is produced when the A/C is turned on. This symptom is usually caused by a loose or worn air conditioning compressor belt. This places a load on the engine and the drive belt that rotates the compressor. If the belt is loose or worn the belt can slip on the compressor pulley and emit a loud squeal.
Why does my car AC squeal?
In most cases, a squealing car air conditioner noise is caused by a worn out serpentine belt. The serpentine belt is a long, winding belt that keeps many crucial parts of your car functioning, including the power steering pump, air pump, water pump, alternator, and (of course) your air conditioner.
Why does my serpentine belt keep squealing?
If All Else Fails If the squeal does not stop, or returns quickly, the serpentine belt is glazed. Glazing of the belt occurs after a prolonged period of slipping across the surface of one or more pulleys and can usually be seen as a reflective sheen on the ribbed side.
How does the serpentine belt work on a car?
by Allen Moore. The serpentine belt, or fan belt, as some call it, transfers power from the engine crankshaft to the various engine accessories, such as the alternator, power steering pump etc. When the belt doesn’t maintain constant adhesion to the various pulleys, it begins to slip and squeal.
Why does my car belt squeak when I start up?
Squeaks that only occur when there is an early morning dew or heavy fog means there is moisture on the belt. It should disappear as the engine warms up. Cold temperatures will stiffen the rubber in the belt, causing it to make a noise on start-up.
What are the symptoms of a bad serpentine drive belt?
Symptoms of a Bad or Failing Serpentine/Drive Belt. Common signs include a squealing noise from the front of the vehicle, power steering and AC not working, engine overheating, and cracks on the belt.