Suspension - Whistling Noise From Vehicle Front/Rear

Date: December 11, 2008

Order No.: P-B-32.50/71

Supersedes:

Group: 32

SUBJECT:
Model 216.371/376/377

Model 221.171/176/177/179, with Active Body Control (Sales Code 487)

Whistling / Flute Noise From Front or Rear Axle Area

If you receive customer reports in the above model vehicles of a whistling / flute-like noise emanating from the front or rear axle area with the engine idling, replace the Active Body Controls front valve block.

NOTE:
The whistling / flute noise is caused by the internal pressure limiting valve in the front axle ABC valve block. Replacing the rear axle valve block does not remedy the problem, even if the noise is also audible at the rear axle valve unit. This noise is merely transferred to the rear via the hydraulic lines.





Parts Information

NOTE:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on December 11, 2008. Please refer to Netstar -> Star TekInfo -> Star Time for the most current labor time allowance.





In Case of Warranty

Operation: Short test, perform (54-1011)
Active body control(ABC) - front & rear, bleed (32-7498)
Valve body - front axle for act. body control (ABC), replace (after test) (32-7545)