The high pitched whirring noise started this summer. It starts when I start the car or after a long drive on the highway. I've noticed that it rarely starts whirring if the car is cold.
It is unaffected by acceleration, revving the engine in park, or turning the air conditioning or radio off. It seems muffled for a brief moment if I come to a very quick stop. Once, it stopped after I filled the gas tank, but I'm not sure if it's related to the gas or if the car just cooled down. It can be heard inside and out, and most agree it is from the back or underside.
Anyone have any ideas? No warning lights are coming on, and so far, the car is running fine. I'm just scared to take it anywhere.
Sounds like a fuel pump to me. Turn the ignition on without starting the engine, the pump should run for a few seconds and then turn off. If you hear your whirring noise during this time, it's the pump. Get it changed out (or do it yourself) before it goes and you save the cost of a tow truck and can do it at your convenience.