For 1990-2009 cars

#### Special Tools

• | J 39570 Chassis Stethoscope

• | J 41416 Ultrasonic Leak Detector

Caution: An assistant should drive the vehicle while the technician checks for the location of the reported condition. Otherwise, personal injury could result.

To analyze a reported wind noise condition, conduct road test to the vehicle to determine the source of the noise.

Choose a regular route with smooth and straight streets running in all four directions: North, South, East, and West. The area should have little traffic or little noise in order to eliminate interference with the test.

Important: Often there is one primary leak source and one or more secondary leaks that contribute to the noise condition. Repairing only one of the contributing leak sources may not completely eliminate the total noise but only reduce the noise.

Drive the vehicle at the speed in which the noise is noticed, or until the noise is heard. Maintain safe and legal speeds.

Many of the waterleak diagnosis tests are also used for the air noise diagnosis.

Most air noise is caused either by leaking seals or by misaligned body panels. You can diagnose the following types of air noise with the aid of J 41416 or J 39570 :

• | Wind whistle

• | Wind roar

• | Wind rush

When driving at highway speed, air pressure inside the vehicle becomes greater than the air pressure outside. When a leak occurs, the escaping air causes a hiss or a whistle.

Wind roar occurs when air passes over or through an opening between the two body panels. To correct the condition, adjust the alignment to the body panels.

Wind rush occurs when air presses over the vehicle's body, and is related to the aerodynamics of the vehicle. Wind whistle and wind roar are repairable. Rule out wind whistle and wind roar before concluding that the wind noise is due to wind rush.

Perform the following inspections to aid in diagnosing wind whistle or wind roar:

1. Note the details for wind noise:

• | The location with noise perceived

• | The location where the noise is loudest

• | When the noise occurs

• | The vehicle speed

• | The interior fan speed

• | The windows position

• | The noise type

2. Inspect the vehicle for the possible cause of the air noise.
3. Road test the vehicle to determine if the wind noise is external or internal.
4. Visually inspect the following components:

• | Loose fasteners

• | Torn weatherstrips

• | Broken weld joints

• | Sealer and/or adhesive skips