I HAVE A TWO FOLD PROBLEM/SOUND. SOUND FROM LEFT SIDE OF VEHICLE, BUT DIFFERENT SOUND DEPENDING ON THE SPEED.
2008 Volvo XC70 • 63,000 miles
At low speeds 10-20 the sound is more of a low dull noise like driving across a rough road or a nail in the tire. At 65 and 75 mph the sound is a high pitched whistle. The whistle only happens when going 65 or 75. If I go 5 mph either slower or faster the sound stops. My first thought was CV joint, but the car is a 2008 and there is no clicking noise when turning, so my 2nd guess would be a warped brake rotor. Any help is much appreciated.
August 27, 2011.
August 27, 2011.
There are several modes for each pitch of resonant frequency.
Meaning the loudest will be slowest as it has the greater magnitude and they get higher in pitch as you speed up. So, there
are many suspect areas to look at.
Is the left front the only speaker in question? How many speakers does your truck have? Do you have an amplifier?
Inspect the speaker/s that you suspect and see if they are mounted tightly.
If this does not fix it, they are plenty of things to consider and then attack it by process of elimination. Body and suspension noises are hard to nail down.
If you had a warped rotator you would feel the pulsing in the brake pedal.
It could have a rock or maybe the wrong bolt was used to mount the caliper and it is rubbing the surface of the rotor because it is too long.
I will research/put some thought into it and get back with you tomorrow.
I've had the wagon for 2 and 1/2 years and the noise only started 2 weeks ago. The noise is there with the radio off. Is there a possibility it could be the differential since this is an all wheel drive car? At low speeds it almost sounds like a grinding gear. The steering wheel does have a little shimmy when you apply the brakes abruptly.
Aug 27, 2011.
Aug 27, 2011.
After checking for that, it was just the rotor groves as new rotors and pads fixed the problem.
See if the is hemi-spherical scoring or gouging on your rotors. If so, you will need to get new ones.
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