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question

2012 Avalon with 16,000 miles on it. On 11/10/2012 and 01/28/14, car was brought to the dealership for a rear suspension thumping noise happening during cold weather. Both times mechanics said they cannot find anything wrong, nothing is lose with the suspension, and there are no TSBs. Noise happens when going over pot holes in cold weather, thump from rear suspension (both left & right side) like something is loose in the trunk. As soon as the weather warms up, the noise goes away. It is very really annoying to hear this clunk and the dealership not be able to identify the problem. TSB SU005-06 lists similar problems on 2006 Avalons, but nothing for 2012. Please let me know if you have any other ideas on what could be causing this on a car that is only a year old. Thank you.