I do have a video on my phone but not tech savy enough to get it to my computer. The headlights dim and get brighter and so does the interior lights. You can hear the air conditioner come in and out also. Two GM dealers and at least 6 trips have netted us no results. They say there isn't a problem. However, I have it on video. Also the road noise that others have complained about and had new tires, etc put on as recommended. I was told the same thing but didn't let GM dealer put the tires on. Went to independent tire dealer and he said he couldn't sell me in good faith new tires because it wasn't the tires that the bearings were out on the front drivers side. After complaining to GM finally got a second GM dealer to replace the bearings. With in a month the passengers side goes out too. Claims it is from driving on rough country roads. Well I live in town, a mile from work and make two rights to get to work and two lefts to come home. Now that we are over our 36K we now hear the back end doing the same thing and the lights never did get fixed. I am afraid that this seals the deal on further purchases of a Chevy. Not only are they not quality made vehicles, the GM repair folks aren't very knowledgeable or dependable. Try to talk you into everything but fixing the problem. Sad to think what 24K DOESN'T get you anymore.