Tension too High

Wrong belt, improper belt routing or misalignment on pulleys.

Replace belt, check belt, and pulleys for proper belt installation and alignment in grooves.

Wrong pulley.

Check pulley diameters against another vehicle or good parts.

Tensioner inoperative.

Replace tensioner.

Tension too Low

Wrong belt.

Replace belt.

Worn belt.

Replace belt.

Tensioner inoperative or broken internal spring.

Replace tensioner.

(Do not attempt to repair)

Wrong pulley.

Check pulley diameters against another vehicle or good parts.

Belt Chirp

Wrong belt.

Check belt tension.

Belt misaligned.

Check pulley alignment.

Belt installed incorrectly.

Check for belt alignment in grooves.

Tensioner inoperative.

Check belt tensioner motion.

Tensioner partially seized.

Check tensioner movement.

Intermittent Squeal or Whistle Noise

NOTE: Diagnosis is difficult. Requires accessory drive belt removal and engine cold starts to validate concern. Do not run engine for more than three minutes with accessory drive belt off.

Tensioner inoperative.

Check belt tension.

Tensioner/idler pulley bearing.

Check tensioner/idler pulley bearings.

Tensioner inoperative.

Check belt tension.

Tensioner/idler pulley bearing.

Check tensioner/idler pulley bearings.

Wrong belt.

Check for proper belt.

Worn belt.

Inspect belt for wear and check tension.

Excessive pulley radial/axial runout.

Replace pulley.

Belt misaligned.

Check pulley alignment.

Water pump, power steering pump, generator, A/C compressor, tensioner or idler bearing/loads.

Check all accessories for bearing/component seizure.

Oil pump pressure regulator.

Replace oil pump pressure regulator valve.

Accessory Drive Growl with A/C On During Acceleration and/or Growl from Belt Tensioner.

Belt tensioner (internal).

CAUTION: DO NOT DISASSEMBLE BELT TENSIONER.

Check belt tensioner movement. Check belt tension.

Water pump, power steering pump, generator, A/C compressor, tensioner, or idler bearing.

Replace faulty component.

Hoot or Growl Noise

Idler pulley bearing.

Replace idler pulley bearing.