LG Refrigerator Losing Cold Air Between Doors? Mullion Rail Flipper AGU75188619 – Fix Door Seal Fast

If your LG French door refrigerator is losing cold air between the doors, has visible gaps in the center seal, or the mullion flap doesn’t spring back into position when the door closes, the door mullion rail flipper is the cause. In LG LMXS, LFXS, and LFX series French door refrigerators, the mullion rail flipper is the magnetic flap assembly that seals the gap between the left and right refrigerator doors — it pivots out of the way when a door opens and snaps back to seal when both doors are closed. When it breaks, warps, or loses its magnetic retention, cold air escapes continuously, the compressor overworks, and energy costs rise. ⚡ Common wear item on LG French door refrigerators. Part AGU75188619 is the genuine OEM replacement that restores a complete door seal and normal energy efficiency immediately.

❓ Is This the Right Part?

This is the correct fix if ALL of the following are true:

• ✔ Refrigerator is cooling normally — compressor runs and temperatures are stable
• ✔ Door gaskets on both doors are intact and sealing correctly
• ✔ Door hinges are aligned and doors close fully without obstruction
• ✔ ONLY problem is the center mullion flap not sealing, broken, warped, or not returning to position

Not sure? Send us your model number — we'll confirm before you order.

🔧 Common Symptoms

• Visible gap between the two refrigerator doors when both are closed
• Mullion flap broken, cracked, or physically damaged
• Mullion flap doesn’t spring back to center position after door opens
• Cold air escaping from the center of the refrigerator — warm spot between doors
• Compressor running more frequently than normal
• Condensation or frost forming on the interior center wall between doors

✔ If these symptoms match, this is the most likely failed component in the door sealing system.

✔ In most cases, replacing this mullion rail flipper restores a complete door seal immediately.

📦 Part Details

• Part Number: AGU75188619
• Type: Refrigerator Door Mullion Rail Flipper — magnetic center flap assembly that seals the gap between French door panels; pivots on open, snaps to seal on close
• Replaces: AGU73530710, AGU73530711, AGU73530713, AGU74110901, AGU74110904, AGU75188613, AGU75188618, AGU75188629, AGU73530705, AGU73530708 (no modification required)
• Brands: LG, Kenmore

⚙️ Installation

Skill Level: Easy — 10 to 20 minutes. No power disconnect required for this repair. The mullion rail flipper is mounted to the refrigerator cabinet between the two doors — remove the mounting screws or release the snap clips, slide out the old assembly, and snap or screw the new one into position. No tools required on most models.

✓ Compatible Models

Confirmed compatible with LMXS28626S, LMXS28626D, LMXS28596S, LMXS28596D, LMXS28596M, LMXS28636S, LMXS27626S, LFXS28566S, LFXS28566D, LFXS28566M, LFXS28968S, LFXS28968D, LFXS28968M, LFXS26596S, LFXS26596D, LFXS26596M, LFXS28596S, LFXS28596D, LFXS28596M, LFXS26973S, LFXS26973D, LFXS27566S, LFXS27466S, LFXS26566S, LFXS26566M, LFXS24626S, LFXS24566S, LFXC22596S, LFXC22596D, LFXC22526S, LFXC22526D, LFCC22426S, LFCC23596S, LFCS27596S, LFCS28768S, LFX28978ST, LFX28978SB, LFX28978SW, LFX28968ST, LFX28968SB, LFX28968SW, LFX28979ST, LFX28991ST, LFX25974ST, LFX25974SB, LFX25974SW, LFX25973ST, LFX21976ST, LMX28988ST, LMX21986ST, LMWC23626S, LMWS27626S, LSFS213ST, LSMX211ST, LRFXS2503S, LRFXS2503D, LRFDS2503S, LFC28768ST, LFC28768SB, LFC28768SW, plus Kenmore 795-series numeric models. Contact us to verify your exact model number before ordering.

💡 Pro Tip

✓ Model-Specific Repair Pages