This is such a terrible question and I can alreade hear the laughter, but I need to know.
I have been hearing this noise off and on, and never been able to locate it. The other day I happen to have the hood up when the noise began again, a loud but not screaming hum. I quickly located it in the corner of the engine compartment on the passenger side near the firewall. It looks like a canister of some kind and has several hoses coming off it. I found that if I placed my hand on the top and pressed, I could cause the sound to deminish. I looked through the manual that I have and could not find a picture that was labeled as to what this thing is and what it does.
So my questions are: What is it? Is that hum suppose to be there? What should be done about it if anything?
Thanks for indulging me in my novice questions and for you assistance in resolving them.