I have a 2004 Chevy Impala. If I have the heat or air condtioning on and I go over a bump it stops blowing. When I go over another bump it comes back on. Also, sometimes the last 4 radio preset buttons are lit up and other times they are not. The latest thing that happened, when driving with my brights on, went over a bump and all lights (inside and out) on the car went off. When I turned the brights off all lights came back on. Any ideas? Thanks in advance
Whenever strange things happen electrically, look for a ground problem. Make sure you have a good connection between the negative terminal of the battery and the engine block and a good connection between the negative terminal and the body.