Whining/High-Pitched Whistle Coming From Front of Engine All Light Truck Models Equipped with Engine M272 or M273

A whining or high-pitched whistling noise coming from the front section of the engine may be caused by a faulty upper idler pulley. To resolve, replace the upper idler pulley with a new unit. The pulley is supplied as a package containing the mounting bolt, dust cover and spacer. Fit the spacer between the timing case cover and guide pulley.

Knocking Noise in Rear Door When Operating Power Window Model164.122/172/175/177 186/822/871/886, up to VIN A258996, Model251.122/156/165/175/177, up to VIN A058266

A knocking noise that occurs when the power window is operated downward and reaches the lower limit position may be caused by a broken plastic limit stop. To remedy, perform the following.

1. Remove door lining. Refer to WIS document AR72.12-P-1010GZ (164) or AR72.12-P-1010RT (251).
2. Remove door module. Refer to WIS document AR72.12-P-0103GZ (164) or AR72.12-P-0103RT (251).

   1. Parts Information
      Quantity	Part Name	Part Number
      1	Limit Stop	A164 730 00 28

      Remove broken limit stop from door.

3. Install new limit stop (Figure 1).
4. Reinstall door module. Refer to WIS document AR72.12-P-0103GZ (164) or AR72.12-P-0103RT (251).
5. Reinstall door lining. Refer to WIS document AR72.12-P-1010GZ (164) or AR72.12-P-1010RT (251).
6. Renormalize power windows.