Details

• Brand:

  

  

• SKU:

  L1MZ-18476-BB

• Positions: Front
• Other Names:

  HVAC Heater Core, Radiator And Seal Assembly Heater, hc90

• Description:

  This is a genuine Ford primary HVAC heater core, a copper-and-aluminum radiator-style assembly mounted inside the dash that transfers heat from the engine coolant loop to the cabin air stream. It fits 20-25 Explorer and 20-25 Police Interceptor Utility platforms for the front, or primary, HVAC system, distinct from the auxiliary heater core L1MZ-18476-CB used for the rear climate zone. Owners reach for this part when a sweet coolant smell appears inside the cabin, when the passenger floor or carpet shows wet coolant residue, when the windshield fogs with an oily film that defrost cannot clear, or when measured heater output drops with a corresponding slow coolant loss from the overflow tank. Heater core replacement on this platform requires substantial dash disassembly per Ford service procedure, so technicians often pair this job with HVAC blower motor, evaporator core, or A/C expansion valve service while the dash is open. The genuine Ford replacement arrives with the correct inlet and outlet pipe geometry, the original tube-fin pitch matched to factory airflow calibration, and o-ring seal hardware where required for the connection at the heater hose interface. Always flush the engine cooling system thoroughly before fitting a new heater core to prevent the contamination that caused the original failure from migrating into the replacement. Pressure test the cooling system after installation, bleed air per the Ford procedure, and verify equal temperature output at all dash vents on full hot before returning the vehicle to the customer. Inspect heater hoses for cracking.

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