- Symptom Definitions

The following are symptomatic noises of the drive belt system:

Chirping
^ A high pitched noise that is usually heard once per revolution of a drive belt pulley or a drive belt.
^ It is most common on cold, damp mornings.
^ Verify this condition by squirting water onto the drive belt. The noise will momentarily stop.

Squeal
^ A loud screeching noise that is caused by a slipping drive belt (this is unusual for a multi-ribbed drive belt).
^ The noise occurs when a heavy load is applied to the drive belt, such as an air conditioning compressor engagement, snapping the throttle, or slipping on a seized drive belt pulley.

Whine
A high-pitched continuous noise that may be caused by a failed component bearing.

Faint Cycle Rumbling
A low-frequency noise heard once per revolution of the drive belt.

Pilling
^ The random accumulation of rubber dust in the bottom of the multi-ribbed drive belt grooves.
^ A small amount of pilling is normal.
^ Operation of the drive belt system will not be affected unless the buildup exceeds one third (1/3) of the drive belt groove depth.
Multi-ribbed drive belts wear evenly with their drive belt pulleys. Unusual wear indicates a correction is needed.