odd buzzing

[MasterofDisaster]

I was cruising on I-75 in Michigan last night; temperature was about freezing. I was about 85mph in 5th gear. Car was fully warm, and after about five miles on the interstate, there was a buzzing noise on the passenger side inside the car. I thought it might have been something loose on the dash, but pressing on the dash and the other panels I could reach did not change the buzz. It sounded a little like when a piece of paper falls into the fan, so I turned off the fan, no change. Full speed fan did not change the frequency or volume. I thought maybe the speaker was rattling with the radio, but turning the radio up, down, or off made no difference. After about 5 miles the buzzing just stopped on its own.

I felt around the kick panel and trim today, and nothing seems loose or out of place. Any idea what caused the buzz? Any idea how to diagnose?

 

[stkjock]

have you heard in on any other roadway? is this a roadway you drive on daily?

 

[MasterofDisaster]

Never heard it on any other road. It was only for a fairly new stretch of asphalt in Saginaw, Michigan. It hasn't buzzed again. I drove the same stretch last night, and there was no buzz.

 

[stkjock]

ok, I questioned it as there's a newly paved highway section near me that I get an odd road noise from, it was of concern the first time I drove over it, there's no noise any other part of the roadway.

 

[07 Boss]

I had a buzzing that took me a few weeks to find. Ended up being the overhead map lights. Gave it a bang with my hand and it disappeared. Occasionally I have something in the glove box that will start to make noise if the contents shift. I also stopped putting coins in my cup holder.

 

[Laga]

I too had a very irritating sound coming from the passenger side of the car. Sometimes it would go on and on without stopping, driving me crazy. I finally got rid of it after I stopped taking my wife with me.

 

[Pentalab]

I got noise from the damned rearview mirror, like a low freq buzzing / vibration. Passenger with me put her hand on it..and it stopped. I had been chasing that noise for years now. I was 100% convinced it was in the dash.

 

[Robert Larimer]

These are all incidents of "sympathetic vibrations" where the car makes a certain frequency vibration and other objects join in. I had a button on my rear view mirror do it and there is another in my driver side door I think from the latch cable hitting the door. A piece of black electrical tape fixed the RV mirror button buzzing.

 

[MasterofDisaster]

I had a buzzing that took me a few weeks to find. Ended up being the overhead map lights. Gave it a bang with my hand and it disappeared. Occasionally I have something in the glove box that will start to make noise if the contents shift. I also stopped putting coins in my cup holder.

I'll have to check that if it starts again.

 

[MasterofDisaster]

These are all incidents of "sympathetic vibrations" where the car makes a certain frequency vibration and other objects join in. I had a button on my rear view mirror do it and there is another in my driver side door I think from the latch cable hitting the door. A piece of black electrical tape fixed the RV mirror button buzzing.

Concur on the sympathetic vibration aspect.

 

[MasterofDisaster]

I got noise from the damned rearview mirror, like a low freq buzzing / vibration. Passenger with me put her hand on it..and it stopped. I had been chasing that noise for years now. I was 100% convinced it was in the dash.

I will check that next time I hear a buzz.