Hi, I'm new to the forum and this is my first post. I'll do a full intro to the community
later.
I have a 2009 CTS base model with 114K miles on it. We're the original owners.
About 2 weeks ago we started noticing a rumble at about 50mph. It's not a squeal,
more of a growling sound with a constant vibration. I can't hear anything extra with the
windows down. I haven't been able to isolate it as front, back, left or right.
It doesn't matter what the road surface is like. It gets a little louder at higher speeds.
Turning left makes it louder, turning right makes it quieter. Braking or shifting into
neutral and coasting makes no difference.
I had the brakes done and they pull tested so bearings are not likely. Wrong sound
anyway. New OE pads and rotors turned, no change.
I've read about the Drone/Vibration issue here on the forum and while there are
similarities, this was not an ongoing issue. This 09 has been quiet and smooth from
day 1. The drive shaft has never been disconnected so I would doubt an indexing
issue.
I had a fluid change done yesterday and the guy did a road test. He thinks bearing but
the pull test was good and the sound is very-very low pitched. It isn't a whine so I
have doubts about the read differential, but it's possible.
I did notice that my coolant fan is making a noise that sounds like the same frequency
and I don't remember it doing that before. The right left turning change makes me
skeptical but I'm going to change it tomorrow anyway.
Any of this sound familiar to anyone?
TIA
later.
I have a 2009 CTS base model with 114K miles on it. We're the original owners.
About 2 weeks ago we started noticing a rumble at about 50mph. It's not a squeal,
more of a growling sound with a constant vibration. I can't hear anything extra with the
windows down. I haven't been able to isolate it as front, back, left or right.
It doesn't matter what the road surface is like. It gets a little louder at higher speeds.
Turning left makes it louder, turning right makes it quieter. Braking or shifting into
neutral and coasting makes no difference.
I had the brakes done and they pull tested so bearings are not likely. Wrong sound
anyway. New OE pads and rotors turned, no change.
I've read about the Drone/Vibration issue here on the forum and while there are
similarities, this was not an ongoing issue. This 09 has been quiet and smooth from
day 1. The drive shaft has never been disconnected so I would doubt an indexing
issue.
I had a fluid change done yesterday and the guy did a road test. He thinks bearing but
the pull test was good and the sound is very-very low pitched. It isn't a whine so I
have doubts about the read differential, but it's possible.
I did notice that my coolant fan is making a noise that sounds like the same frequency
and I don't remember it doing that before. The right left turning change makes me
skeptical but I'm going to change it tomorrow anyway.
Any of this sound familiar to anyone?
TIA