Whirlpool Refrigerator Defrost Heater Assembly / Defrost Heater and Evaporator Harness Assembly W11650661, Replaces W11573117

Defrost heater and evaporator harness assembly including the thermal fuse; connects the defrost heater and evaporator fan motor to the refrigerator electrical circuits.

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✅ Cross Reference Information

Common Symptoms

• Refrigerator is not defrosting
• Heavy frost or ice accumulates on the evaporator
• Refrigerator runs constantly
• Freezer remains cold while the refrigerator compartment becomes warm
• Cooling performance decreases as frost restricts airflow

Check Before Replacing

• Disconnect electrical power before inspecting or testing the assembly.
• Inspect the evaporator area for frost or ice buildup that could indicate a defrost-system problem.
• Using the refrigerator’s model-specific tech sheet, run the applicable forced-defrost or service diagnostic and observe whether the heater circuit is commanded on.
• With power disconnected, check heater and thermal-fuse continuity according to the model’s technical documentation; an open circuit indicates a fault in that circuit, but does not by itself identify which defrost component caused the problem.
• Inspect the harness connectors and wiring for loose terminals, damaged insulation, or signs of overheating; do not bypass the thermal fuse.

Pro Tip

Part Details

Key Features

• Genuine Whirlpool OEM refrigerator assembly
• Combines the defrost heater and evaporator-fan-motor wiring harness
• Includes an integrated thermal fuse for over-temperature protection
• Replaces prior manufacturer number W11573117

Installation Notes

• Disconnect power before beginning service and allow the evaporator area to thaw as needed without damaging the liner or wiring.
• Use the refrigerator’s model-specific service information for panel removal, connector locations, and diagnostic procedures.
• Replace the complete assembly with the connectors and harness routed in the same manner as the original; do not alter or bypass the thermal fuse.
• After installation, verify that connectors are fully seated and that wiring is clear of the evaporator, fan, and other moving or sharp components before restoring power.

Verified Compatible Models

ASI2575GRB08, ASI2575GRB11, ASI2575GRS08, ASI2575GRS11, ASI2575GRW08, ASI2575GRW11, MSS25C4MGB06, MSS25C4MGW06, MSS25C4MGZ06, MSS25C4MGZ08, MSS25C4MGZ09, MSS25N4MKZ04, MSS25N4MKZ09, MSS25N4MKZ10, MSS25N4MKZ11

Fitment reminder: Match the complete appliance model number, including suffix or revision where applicable, before ordering.