Found this TSB
06-08-49-005 TSB Snap/Pop Type Noise Coming from Instrument Panel or Windshield Area (Modify IP Retaining Slots and Replace Mylar Tape) February 16, 2006
Have had 2007 CTS 1 week and this seems to be what is happening. Can not make it happen when at dealer, but sounds like a big rock hitting the windshield. Any ideas?
06-08-49-005 TSB Snap/Pop Type Noise Coming from Instrument Panel or Windshield Area (Modify IP Retaining Slots and Replace Mylar Tape) February 16, 2006
Have had 2007 CTS 1 week and this seems to be what is happening. Can not make it happen when at dealer, but sounds like a big rock hitting the windshield. Any ideas?