Tech Tip: Mercedes-Benz Noises, Vibration At Steering Wheel With A/C Switched On

Tech Tip: Mercedes-Benz Noises, Vibration At Steering Wheel With A/C Switched On

If you receive customer reports on Model 209.372/472 vehicles of a groaning noise and vibration felt in the steering wheel at engine speeds between 800 and 2,000 rpm and with the A/C on, the cause may be the transfer of vibration from the A/C compressor through the high-pressure power steering hose to the steering wheel.

If you receive customer reports on Model 209.372/472 vehicles of a groaning noise and vibration felt in the steering wheel at engine speeds ­between 800 and 2,000 rpm (mostly heard around 1,600 rpm) and with the A/C on, the cause may be the transfer of vibration from the A/C compressor through the high-pressure power steering hose to the steering wheel. To remedy the noise, install a rubber buffer at the high-pressure power steering line to the steering gear bracket as described below.

Note: Noise and vibration frequency might change at the steering wheel end stops and then reduce with the A/C off.fig. 1

Procedure:

1. Remove the lower engine compartment ­paneling.

2. Remove the screws (see Figure 1, 1 and 2) from the brackets securing the high-pressure power steering line (power steering pump to the steering gear hose).fig. 2

3. Gently move the line and install the rubber buffer (see Figure 2, 3) by screwing it into the power steering rack housing (hole after removing the screw 1 in Figure 1).

Note: Do not over-tighten the rubber buffer as the rubber part might tear.

4. Position the high-pressure power steering line bracket onto the installed rubber buffer as Fig. 3shown in Figure 3 (arrow), and secure it with a nut (Figure 2, 4). Tighten to 10 Nm.

5. Reattach the screw (Figure 1, 2) with the bracket at the other end of the high-pressure power steering line.

Note: Ensure that the high-pressure power steering line does not come in contact with other parts of the vehicle.

6. Reinstall the lower engine compartment ­paneling as indicated in step 1.

Courtesy of MotoLOGIC® Repair & Diagnostics: www.motoshop.com/motologic.

 

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