Refrigerator Not Cooling? LG Evaporator Assembly 5421JJ1001T – Fix Warm Fridge Fast
If your LG refrigerator is running but not cooling, a failed evaporator assembly is the most common cause. In most LG refrigerators, the evaporator assembly is responsible for absorbing heat from inside the cabinet. When it fails, the refrigerator loses its ability to maintain temperature — food warms, ice melts, and the compressor runs continuously without result. ⚡ Common failure point in LG-built bottom-freezer and French door refrigerators. Part 5421JJ1001T is the genuine OEM replacement that restores proper heat exchange and returns your refrigerator to full cooling performance.
❓ Is This the Right Part?
This is the correct fix if ALL of the following are true:
- ✔ Refrigerator powers on and compressor runs
- ✔ Freezer section may still partially cool but fridge compartment is warm
- ✔ Condenser fan and evaporator fan are confirmed operational
- ✔ ONLY problem is inadequate or no cooling in the refrigerator section
Not sure? Send us your model number — we'll confirm before you order.
🔧 Common Symptoms
- Refrigerator section warm or not cooling despite compressor running
- Frost buildup on evaporator coils or back wall of freezer
- Compressor runs continuously without reaching set temperature
- Food spoiling faster than normal; ice production reduced or stopped
✔ If these symptoms match, this is the most likely failed component in the system.
✔ In most cases, replacing this evaporator assembly restores normal cooling operation immediately.
📦 Part Details
- Part Number: 5421JJ1001T
- Type: Refrigerator Evaporator Assembly — Genuine OEM
- Replaces: 5421JJ1001T (original), 71323 (cross-reference)
- Brands: LG, Frigidaire (select models)
While the evaporator is out, inspect and replace the defrost heater and defrost thermostat — these components work together and often fail in sequence. Replacing them at the same time avoids a repeat repair call and saves significant labour.
⚙️ Installation
Skill Level: MODERATE — 45–75 minutes. Disconnect power before servicing. Remove freezer shelving and back panel to access the evaporator. Disconnect refrigerant lines if applicable (may require certified technician in some jurisdictions). Swap the assembly, reconnect wiring harness, reinstall panel, and restore power. Allow 24 hours for full temperature stabilization.
✓ Compatible Models
Confirmed compatible with GM-F223DSTB.ASTCNA0, GM-F223DSXM.ASTCNA4, GLFC22770ST, GLFCS22520D, GLFCS22520S, GLFDS22520S, GLFNS22520D plus additional LG models. Contact us to verify your model number before ordering.
💡 Pro Tip
A failed evaporator is often the result of a defrost system that stopped working — meaning the root cause may be the defrost heater or thermostat, not just the evaporator itself. Replacing the evaporator alone without addressing the defrost system can lead to the same failure within months. Order the defrost heater and thermostat together with this assembly for a complete, lasting repair.
🔁 Old Part Numbers & Cross References
This part is also known by the following numbers: 5421JJ1001T, 71323. If your service manual, parts diagram, or old receipt shows any of these numbers, this is the correct replacement.
📋 Model Number Reference
GM-F223DSTB.ASTCNA0 | GM-F223DSXM.ASTCNA4 | GLFC22770ST | GLFCS22520D | GLFCS22520S | GLFDS22520S | GLFNS22520D | 71323
✓ Model-Specific Repair Pages
✅Compatibility & Cross Reference
Not sure about your model number? Call 1-877-899-7278 and we’ll help you confirm. All brand names are the property of their respective owners and are used for compatibility reference only.
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