I have a 2001 Toyota Sienna with 115,000 miles on it. After about 15 minutes of driving, a vibrating buzzing dentist-drill like sound begins to come from the back left of the car (this is also where I put in the gas if that has anything to do with it). I do not know what it sounds like from the outside but its definitely a buzzing sound from the inside. As I increase in RPMs the buzzing sound gets more and more high pitched.
I do not drive this car very much, but about a month ago I was driving down a mountain using the breaks a lot and the buzzing sound started for the first time with a rubber smell. At this point because of the rubber smell, we just thought it was an issue with the breaks and after taking a 20 minute rest, the car drove the rest of the 400 miles or so perfectly fine without any buzzing. I don’t use the car very much because I am in college, but when I do, like I said, after 15 minutes this buzzing starts.
If anyone has any advice about what could be causing this it would be greatly appreciated. Also if anyone knows how much the fix will cost, that will also be greatly appreciated.