Since I got my 2013 Impala LTZ, it has a prominent rattle that is heard at about the 10 o'clock position from the steering wheel. It sounds like loose plastic on metal / metal on metal sound, and is completely random yet quite frequent. As long as the vehicle is in motion, it can be heard. When the car is above 40MPH, and accelerating on a sharp curve, it gets really loud. I've alluded to it being a dash rattle, but I'm not so sure that's what it is now.
Let me tell you what I've done.
1. Ripped/taken apart the entire dash. This includes:
- The gauge cluster
- The radio
- All front vents
- All faux wood trim
- AC control unit
- Both A-pillar covers
- Front plastic vent trim
- Steering wheel kick panel
- Shifter trim
- Glove compartment
- Sunglasses holder/garage receiver unit
- Dash pad (only slightly lifted this and put foam underneath the problem area, which is to the left of the steering wheel where it curves downward)
In every possible place that plastic touches other plastic parts or metal and lock into place, I've put felt tape and felt dots. And seriously, I mean EVERYWHERE, even down to the bolt holes. I also tightened down everything which I found loose, and there were quite a few loose bolts. Loose as in I could turn them with my fingers.
2. Taken apart all 4 doors trim. I went out and bought rubber/foam weatherstripping, and installed them everywhere where metal/plastic could possibly rattle, and put them all back together.
3. Front seats.
4. Changed the tires to one of the best tires for this car (Continental PureContacts) and got a full 4 wheel alignment.
5. Took the car to two different dealers for a total of 5 times complaining about the rattle. Each time, they say they can't reproduce it.
6. Got underneath car to check to see if there were any wires or cables which might have came loose from their grommets. Checked the same in the engine bay, and nothing is loose, touching, or looks like it might cause the noise.
7. Checked the rear seats. Lifted them up, and put heavy duty felt dots on all points where the seat plastic touches metal. Put felt tape on all the seatbelt mechanisms, where they touch the metal brackets they are mounted on.
8. Checked the trunk. Found that the Bose amplifier was floating around in the cavity back there. Secured it, which got rid of the loud "clank" noise whenever the car would go over bumps.
As a result of my efforts, I've gotten very knowledgeable on how to solve a ton of rattling in the car...but this one rattle WILL NOT GO AWAY. It is the most annoying of all the rattles, and one which is making me go mad. The dealers won't help, and despite my best efforts, I can't find it. I'm at the point now where the car is practically silent except for this rattle.
Here's an example of how it sounds.
As you can probably tell, I am slightly OCD ; I would appreciate any advice/suggestions anyone can give. Help!