To signal to a driver in front of you that you want to pass, pull the turn signal/multifunction lever until the high-beam headlamps come on. Then release the lever to turn them off.
Chevrolet Cobalt Service & Repair Manual. Noise, Diagnosis
A visual inspection must always
be performed to confirm the presence of aftermarket components, potential
collision damage, or areas of concern.
A noise produced by a vibration
can be diagnosed in the same manner as a vibration. A noise produced by
wind, leaks, or ...