Over the course of a few months I have noticed an ever increasingly louder popping noise coming from under my seat when I drive. It happens just as I am about to stop and after I take off from a stop. I can't duplicate it by moving around in the seat.

I took it in last week and was told it was the A/C vent under my seat, but I really doubt that is the problem.

I have less than 12K on my 2009 Touring.

Anyone else experience this problem, and hopefully had it repaired could share what the problem was?