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Q:

Both sliding doors are almost impossible to open. They drag, make grinding noise on 2003 Kia Sedona

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Doors useless. Grandkids and friends climb in through rear hatch.
(1) Answer
put some oil on the inside doors.