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Inside bubbling noise
I have about 4K miles in my card but I noted at around 3.5k mark a new noise when idle. The noise can only be head from the inside and only happes in idle when the car if fully warmed up. It is not loud and it is like a bubbling noise like a air valve opening and closing. It is kind of erratic but it is always there.
It is not bordering me i just want to know what causes it.
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