Warning:Refer toAssistant Driving Warning.
Interior windnoise is not heard when the window is lowered.Interior windnoise is caused by the air leaving the inside of thevehicle through a seal or a seam.
Tape over the relief valves to cause added air pressurewithin the vehicle.Test drive the vehicle and listen for windnoise or awhistle.Pull the vehicle over and make the temporary repairs usingmasking tape. If you cannot determine the source of the windnoise,perform one or more of the following diagnostic tests:Air Pressure TestSoap Suds or Bubble TestTracing Powder or Chalk TestBalance Shaft Cleaning and Inspection Engine Block Cylinder Block Balance Shaft
Clean the balance shafts-(1) in solvent.Inspect the bearing surfaces on the balance shafts forscoring or unusual wear.Note:Do not remove the balance shaft drive sprockets.Inspect the balance shaft drive sprockets for wear, damage,or missing teeth.Measure the rear bearing journals on the balance shaf ...