Two problems related to door have been reported for the 1997 Mercury Grand Marquis. The most recently reported issues are listed below.
Purchased an after market inside door handle from an ebay vendor: inside front drivers side door handle for a 1997 Mercury Grand Marquis GS. The return spring on the original oem handle broke, but the original handle even though broken, still remained operational. I ordered and installed a replacement aftermarket door handle "depo" 330-500006-002 purchased from an ebay vendor. 10 days after installation, the replacement door handle failed and the drivers door could not be opened from the inside of the car making this a potential safety hazard had there been an emergency. Obviously the after market part was not properly tested before sale to the public.
Wind noise on front doors.