I've had a clunk for years and it's not water related. It's suspension related I believe. Replaced rear struts with a quick strut kit, replaced stabilizer links, the lower easier to replace cross beam bars, the forward to front of axle lateral bars. Only thing I haven't replaced is the sway bar. Replaced the bushings at the same time I did all the other stuff.
It is mainly worse when people are in the rear seats , 1 or more people and the lore the worse the sound. Wheel bearings, brakes and rotors have also been replaced. All this was done as a 10 year complete suspension rebuild which was roughly $1200 in parts including the front rack & pinion, front quick struts, front sway bar and sway bar links. This didn't include an alignment afterwards which was around $70 or so give or take.
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Funny my 2012, which has a long nightmare story I’ll tell if I can ever get time(electrical, trans, speedometer, traction control, hubs, stabilitrak, and many more general electrical problems), had a clunk that sounded like coming from under car toward rear maybe even right under passenger seat and was driving me crazy. Checked all suspension, brake system, all bushings, etc. and couldn’t pinpoint it.
Next focused on exhaust because was more evident on bumpy roads and sounded like it could be muffler bouncing around, found nothing.
Finally had car in air repairing the electrical problem mentioned above and just started pushing/pulling on everything under car. Was the dang shield over gas tank. Hit it with my hand and it clunked. At front of tank the shield was sitting against underbody of car and every time car hit a bump or driving fast on uneven roads the shield would come off the body and slam back against it. Popped push-ins out that were closest to that area, shield dropped down some, little light bending there and opposite end to make it sit flat against tank again and not touch underbody in any way, and noise is gone.
Been a mechanic 30 years and I have never seen such a thin piece of metal make such a loud noise. Noise sounded like someone hitting something in rear end with a small hammer.
I’m not sure what gens have the shield but if it does check all the way around it and tank to see if shield is touching body anywhere. Can’t remember if my 2010 had the shield or not, been a while since was under it and it has moved on thanks to a deer on a long dark highway. And sure can’t remember if the 2004 had it, that was way too far back lol. Damn I’m getting old. Anyway, just trying to say don’t discount the shields that cover everything under the car, I did at first and it cost me a few months of frustration before I finally figured it out.
Will get back when have more time to tell the story of the 2012. Wanted to share because this forum has helped me tremendously over the years. Always been in such a hurry never even created an account until a couple months ago. So feel like it’s time I give back a little since have to slow life down some, or more accurately life is slowing me down.