What a door seal gap actually means
Your fridge door has a soft rubber gasket running all the way around it, with a magnetic strip hidden inside. That gasket's whole job is to grab the metal frame and hold cold air in.
A "gap" means the gasket isn't touching the frame somewhere. You might see daylight in the corner, feel cool air leaking out, or notice condensation forming right along the seam.
Good news: this is one of the more forgiving fridge problems. It's rated low urgency, it's usually DIY-friendly, and the part is cheap.
The trick is figuring out whether the gasket is the problem or just the messenger. A lot of gaps trace back to a dirty seal, an overloaded door, or a fridge that's out of level. Chasing a new gasket when the real issue is a sagging door just wastes $60.
Why your fridge door seal is gapping
Start with the cheapest, most common causes and work up. Most gaps fall into three buckets: a dirty gasket, a tired gasket, or a door that's out of position.
A dirty gasket is the sneaky one. Sticky spills dry in the folds and hold the rubber slightly off the frame. People replace a perfectly good gasket that just needed a wipe-down.
A tired gasket is age. After 8 to 12 years the vinyl hardens and the magnet weakens. You'll feel it in the dollar-bill test, where the drag is gone in one spot or all the way around.
The alignment causes are about the door, not the seal. A door stuffed with heavy jugs droops on its hinge and lifts the top corner. A fridge sitting crooked on the floor hangs the door crooked too.
Rarer but real: a warped door liner or a broken hinge cam. If the door won't tug itself shut over the last inch, suspect the cam.
Work in order. Clean, then reshape, then lighten and level, then adjust the hinge, and only then replace the gasket. You'll fix most gaps before you ever touch a parts order.