How to Repair a Rust Spot on a Frigidaire Refrigerator

Unplug the refrigerator from the wall outlet.

Tape the ice maker and water supply lines away from the rusted section to keep the workspace clear.

Score a rectangle around the rust, leaving a 2-3 inch margin, with a rotary cutting tool and metal blade.

Keep the blade shallow because the cabinet skin is very thin and separated from the foam.

Lift off the cut panel and any loose rust with needle nose pliers.

Stop cutting as soon as solid metal is clear to prevent piercing the refrigerant circuit.

Inspect the cavity; ice-filled foam feels hard and reads cold on an IR camera.

Let the unit sit unplugged until the foam softens; overnight is usually enough.

Dig out dark, soggy insulation until only dry, light-colored foam remains.

Press on questionable areas; if water oozes out, remove that section too.

Measure clearance and maintain roughly a quarter-inch gap between the pipe and the future back panel plane.

Gently push the pipe inward with a rubber mallet, wooden dowel, or fingers if it touches the metal.

Shake a can of moisture-resistant low-expansion spray foam as directed.

Insert the nozzle behind the pipe and fill the space from back to front in slow passes.

Cut excess foam level with the surrounding cabinet using a serrated knife.

Cut a flat sheet of closed-cell insulation to match the opening size.

Press the sheet into the cavity so it sits flush without overlapping the factory metal skin.

Run a continuous bead of silicone sealant around the perimeter of the new foam sheet.

Tool the bead smooth to eliminate air gaps and improve adhesion.

Cover the repair with overlapping strips of foil HVAC tape.

Press each strip firmly with a putty knife to lock the adhesive and remove air pockets.

Reconnect any lines moved earlier and plug the refrigerator back in.

Operate the unit for at least one week while monitoring the patched area with touch or an IR camera.