I bought a 2002 audi tt quattro in october. I was driving it the other day and the battery light went on, followed by the esp, abs, brake and generator lights. Then once the passenger door was opened the driver window rolled itself down and won't roll back up. later that day realized when the engine is revved up the radio quits and the lights to the heater shut off. after awhile the radio would turn off and on with the headlights. Once we shut off the car we noticed a winding noise coming from the area of the a/c pump. The next morning the car was dead. We replaced the battery and are still having all issues. We are not seeing any issues with the brakes or traction control while driving