Low whistling noise from under driver dash
Thread Starter
Junior Member
Joined: Sep 2007
Posts: 46
Likes: 0
From: Fresno, CA
Blk on Blk C240
Low whistling noise from under driver dash
My 2002 c240 has a very low high pitch whistling noise that comes from under or around the driver dash area. It sounds exactly like your ears are ringing. It fooled me for a while; I thought my own ears were ringing. The sound gets disturbed (goes on and off w/o any pattern) but does not go away when you pump the brake pedals. It comes and goes and I cannot pin point it. The only thing that I can correlate with the sound is that it does not occur if the car is not in motion. I'm thinking it could be some sort of vacuum leak. Anyone have any thoughts? Anyone know what vacuum hoses are around the driver side area if any at all? Any help would be appreciated.
Senior Member
Joined: Aug 2004
Posts: 263
Likes: 11
BMW E30. I've turned to the dark side.
not too much vacuum running under the dash of c240, see if the sound changes with your blower speed. also could be low on refrigerant, try turning off the a/c and see if it changes.
Thread Starter
Junior Member
Joined: Sep 2007
Posts: 46
Likes: 0
From: Fresno, CA
Blk on Blk C240
I had the "low refrigerant" noise before...got an AC service (2 weeks ago) and it went away but the noise in question is still occurring. It was there before I heard the "low refrigerant" noise and its still there now. The noise is still present with the ac turned off and the blue vent roller knob is fully opened. I'll post what I find out.
Newbie
Joined: Nov 2013
Posts: 2
Likes: 0
C240
I purchased a used 2001 C240, excellent condition, clean, one owner, 81k miles, Friday night. While driving home I noticed a whistling noise, which sounded as if it was coming from the passenger side dash. It starts at about 25-30 MPH and gets louder the faster I go. No change in the noise regardless of the heat on or off. It stops when the car stops then regains when moving. It's not brakes, motor or anything mechanical but seeks to be air is catching on something and whistling. It's not the hood ornament either. The dealer states they cannot figure it out however, they are a ford dealership and I think they don't want to spend anymore time or money on her.
My daughter is very sick and we spend 1300 a month in copays for her treatments and travel a lot. I cannot buy a car that needs extensive work later or a new car because of our medical cost. I left it at the dealer Saturday (less than 16 hours of buying it I returned it.). I told them until the annoying whistling noise is gone I will not take her. I'm hoping you can help as I really love this car and I feel the ford dealer won't know these types of issues or will not call the local Mercedes dealer to assist him in finding the noise.
My daughter is very sick and we spend 1300 a month in copays for her treatments and travel a lot. I cannot buy a car that needs extensive work later or a new car because of our medical cost. I left it at the dealer Saturday (less than 16 hours of buying it I returned it.). I told them until the annoying whistling noise is gone I will not take her. I'm hoping you can help as I really love this car and I feel the ford dealer won't know these types of issues or will not call the local Mercedes dealer to assist him in finding the noise.
Thread Starter
Junior Member
Joined: Sep 2007
Posts: 46
Likes: 0
From: Fresno, CA
Blk on Blk C240
I purchased a used 2001 C240, excellent condition, clean, one owner, 81k miles, Friday night. While driving home I noticed a whistling noise, which sounded as if it was coming from the passenger side dash. It starts at about 25-30 MPH and gets louder the faster I go. No change in the noise regardless of the heat on or off. It stops when the car stops then regains when moving. It's not brakes, motor or anything mechanical but seeks to be air is catching on something and whistling. It's not the hood ornament either. The dealer states they cannot figure it out however, they are a ford dealership and I think they don't want to spend anymore time or money on her.
My daughter is very sick and we spend 1300 a month in copays for her treatments and travel a lot. I cannot buy a car that needs extensive work later or a new car because of our medical cost. I left it at the dealer Saturday (less than 16 hours of buying it I returned it.). I told them until the annoying whistling noise is gone I will not take her. I'm hoping you can help as I really love this car and I feel the ford dealer won't know these types of issues or will not call the local Mercedes dealer to assist him in finding the noise.
My daughter is very sick and we spend 1300 a month in copays for her treatments and travel a lot. I cannot buy a car that needs extensive work later or a new car because of our medical cost. I left it at the dealer Saturday (less than 16 hours of buying it I returned it.). I told them until the annoying whistling noise is gone I will not take her. I'm hoping you can help as I really love this car and I feel the ford dealer won't know these types of issues or will not call the local Mercedes dealer to assist him in finding the noise.
