It's a click click sound. Lagataar aati hai, thori si bhi kharab road ho to. Rear view mirror se nhn aati, I am sure of that. It is coming from around the dashboard near the defogging vents for side mirrors. And can be easily heard when one presses the soft top of the dashboard. Weirdly, the dashboard can be pressed and moves quite easily. I think it is due to the whole joint of the soft top material (which can be deformed, rubbery) and the hard plastic of the defogging vents to the front AC vents and again till the other defogging vent.
Seriously, mera to dil hi ur gaya hai is gari se. Sirf 4000 chali hai or azaab main dala hoa hai. Kabhi aik masla kabhi dosra. All interior faults though.
Does your car still make that sound?