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One Rattle And One Clunk

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I have a couple of annoying noises while driving my MY99 C2.

1: The first is a noise that seems to be originating somewhere on the passenger side. The noise is non-existent or very quiet at speeds below 35mph. Above that speed the noise sounds mostly like a rattle and is fairly continuous (what the heck did I just say?). It almost sounds like a cable bouncing or vibrating against the rocker panel under the door and resonating up through the cavity just behind the door.

I have removed the right side (passenger side) speaker cover and speaker and I am pretty certain the noise resonates from that opening. If I stuff a towel in the speaker cavity the noise is muffled. I can not fully determine if the noise is coming from the front or rear but I would say 80% likely it is the front. I do not see anything in the cavity below the rear speaker.

I think if I could access the passenger side (right) rocker panel (area beneath the door) I might be able to determine if something in there is rattling. At the minimum that would allow me to eliminate that as a possible cause of the noise.

My questions:

1A: How does one access the cavity beneath the passenger side (right) door?

1B: Is there a cable or some wiring in that area that could possible be vibrating causing a rattle?

1C: Any other areas I should check for this type of noise?

2: the second noise is from the drivers seat and is more of a clunk when stopping, accelerating or going over a large bump. It seems to happen during weight transfer and the seat may be moving. I will check/tighten the seat bolts to see if that fixes the issue but also wanted to see if there were other areas to check?

Thanks in advance

Chris Taylor

MY99 C2

Rochester, MN

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