I have a 2006 Honda Pilot and the cd player/ radio just stoped working. Every turns on but all i can hear is a low high pitch buzzing noise come from my rear driver side door speaker. And the other speakers have no sound coming from them.

do you have cd in the player-take them all out and see if noise continues-you could also find the fuse for the radio and pull it to see if that stops the noise- cheers Denny

sounds like maybe the built up leaves and stuff might have made the blower overheat and fail prematurely.

Now having never worked on one recently i cannot know but i would be inclined to look under the passenger side dash as most cars with AC seem to have them in this area ,Then follow your nose with the help of a torch

What it sounds like is that your pilot bearing has gone out, and that could be causing the high pitch grinding noise and when the gears are hard to shift that is a tale tale sign of a bad/weak pressure plate and or master cylinder. I would recommend changing out the clutch, pilot bearing, pressure plate, slave cylinder and having the flywheel resurfaced.

It is the battery - you must not have the cables securely placed on the terminals. The same thing happened to me a few months ago.

the tires make steady noise , check the wheel bearing as noises get high and low at the same speed , and i also would check for diff if it's 4wd.

I would grease the wheel bearings and also use lube all the brake parts and use cleaner on them. Check the thickness of the pads.

Fuel pump

Have you checked the fuse?

check for vacuum leak