Lately the Air Pump in my car has been increasing in speed almost like it has two speeds. It starts out at what I'll call normal speed (a sound that I am used to) and then after a few seconds it will go into what sounds like high speed. It doesn't sound like a bearing is out or anything like that. It just sounds like it wants to go two speeds now.
Exactly what is that pump for and do we need it?
Thanks for the help,
Bryan