Toyota
Ford Kuga
 Service Manual
Body Repairs - General Information » Wind Noise
Test method

The test procedures given in the chapter Noise, Vibration and Harshness can also be used to diagnose wind noises.

Road tests

Wind noises can usually only be localized by road tests

NOTE: There should always be two people present during road tests to find noises. A driver who reconstructs the situation causing the noise, and a person to carry out the checks

The following points should be taken into account for such road tests:

  • Check that the tire pressure is correct.
  • Remove non-standard ancillary components from the vehicle.
  • Choose a dry, flat road with as little traffic as possible.
  • Carry out the road test in all speed ranges. Use a high gear so that the engine noise is low
  • Do not perform a road test near any sound reflecting objects.

If it is difficult to detect the noise sources, the search can be made easier by masking potential areas.

Chalk/powder test

This test checks the contact surfaces of seals on doors, hatches and lids.

Process using a door seal as an example: To do this, the door seal is coated with powder or brushed with chalk. A thin layer of grease is applied to the surface against which the seal makes contact. The door must then be slowly closed and reopened. The width and continuity of the imprint can now be checked on the seal.

Smoke test

Flow checking device

Smoke test

Item

Description

1 Test pipe
2 Test pipe opener
3 Puffer ball

Mode of operation: The flow checking device is a set made up of a flow-testing pipe, a test pipe opener, puffer ball and closing-off caps for the pipe.

The test pipe contains a filling layer which is impregnated with fuming sulfuric acid. When air is blown through the pipe by the puffer ball, sulfuric acid aerosol is emitted in the form of a white smoke.

NOTE: Pay attention to the instructions for use and the safety directions issued by the manufacturer.

The smoke test can only be performed in a draft-free environment.

This test can be used to detect leaks visually.

Procedure:

  • Break off both tips of the pipe in the pipe opener, in exceptional cases in the top of the packaging.
  • Insert the pipe into the puffer ball so there are no leaks.
  • Close the hole in the puffer ball with your thumb and press the air contained in the ball through the pipe.
  • Set the ventilation blower in the passenger compartment to the highest setting.
  • Close all doors so that a slight overpressure can build up in the passenger compartment.
  • Move the smoke pipe along the outside of the body to the areas to be checked. Leaks can be detected through the irregular movement of the smoke.

Ultrasonic test

This test searches for leaks in the system of seals or rather acoustic bridges. When an ultrasonic transmitter is placed inside the vehicle, it sends out ultrasonic waves. A leak is located by running a detector along the suspected area. The position with the loudest reception of the escaping ultrasonic waves indicates places where noises occur.

Ultrasonic test device

Ultrasonic test device

Procedure:

  • Place the ultrasonic transmitter in the vehicle.
  • Completely close the vehicle.
  • Search the exterior of the vehicle using the detector
  • The detector provides a simple indication of a leak.

Stethoscope test

Stethoscope

Stethoscope test

    More about «Wind Noise»:

    General information

    Workshop diagnosis

    Test method

    Diagnosis

    Possible concerns with corrective measures

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