2001 Chevrolet Tahoe wipers, windshield & visibility problems

When the lights are in the on position and you are traveling at 20 -25 MPH and take your foot off of the accelerator, the lights will dim for approximately 3 - 4 seconds. The vehicle was taken to a local dealership that stated they could not find anything wrong and that if it were a major problem it would show up some day.

On 6/8/2001, I purchased a 2001 chevrolet tahoe from sewell cadillac-chevrolet. In 2003 hinges on the rear door cargo window had to be replaced/repaired because the window would not close properly because the hinges were coming loose from the vehicle. The cargo window on the rear door was rarely used. The last time it was opened was august, 2009. While the car was being driven on the highway in may, 2010, the cargo window flew off the car.