Four Seasons 54891 A/C Evaporator Core - Rear
OE Quality 60-Day Returns
Four Seasons
 Evaporator Core

Four Seasons 54891 A/C Evaporator Core - Rear

Brand Four Seasons 54891
Position Rear
Core Depth Fraction 3-9/16
Core Depth MM 90.487
Core Height Fraction 7
Core Height MM 177.800
Core Width Fraction 10-35/64
Core Width MM 267.792
Depth 3.500
Depth 3.563
Description Evaporator Cores
Height 7.000
Inlet Fitting Outside Diameter No. 8
Inlet Fitting Type Female O-Ring
Material Aluminum
O-Ring A Number/Desc [24608] / Green O-Ring
O-Ring B Number/Desc [24670] / Green O-Ring
Outlet Fitting Outside Diameter No. 12
Outlet Fitting Type Female Springlock
Type Plate & Fin
Width 10.500
Width 10.546875
Product line Evaporator Core
Fits Ford, Mercury, and Lincoln · 28 vehicles

OE-style replacement. Plate-and-fin evaporator core with aluminum construction.

Female O-ring inlet. Female springlock outlet for straightforward hose connections.

Compact core size. Measures 10-35/64 in. wide, 7 in. high, and 3-9/16 in. deep.

Cross-references Four Seasons 54891, Global Parts Distributors LLC 4711877 and Spectra Premium 1010002 for the same application. See all 26.

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Rear A/C Evaporator Core for Ford and Mercury

Four Seasons 54891 is a rear A/C evaporator core built for select Ford, Lincoln, and Mercury vehicles with rear HVAC systems. It uses an aluminum plate-and-fin design with OE-style inlet and outlet fittings for service replacement on Explorer, Explorer Sport Trac, Mountaineer, and Aviator applications.

Key Features

  • Aluminum plate-and-fin evaporator core construction
  • Core width: 10-35/64 in. (267.792 mm)
  • Core height: 7 in. (177.800 mm)
  • Core depth: 3-9/16 in. (90.487 mm)
  • Inlet fitting: No. 8 female O-ring
  • Outlet fitting: No. 12 female springlock
  • Includes OE-style green O-ring service seals for the listed application
  • Four Seasons evaporator core line for HVAC service replacement

Product Details

This Four Seasons evaporator core, part number 54891, is specified for rear HVAC use and matches the listed dimensions and fitting styles for direct replacement service. The aluminum plate-and-fin construction supports efficient heat transfer in the rear air conditioning circuit, while the OE-style connection points help maintain proper refrigerant line interface on 2002-2010 Ford Explorer, 2003-2005 Lincoln Aviator, 2003-2010 Mercury Mountaineer, and 2003-2010 Ford Explorer Sport Trac applications. This part cross-references UAC EV939682PFC for the same application.

Vehicle Fitment

  • Fits 2003-2010 Ford Explorer, rear.
  • Fits 2009-2010 Ford Explorer Sport Trac, rear.
  • Fits 2003-2005 Ford Explorer Sport Trac, rear.
  • Fits 2003-2010 Mercury Mountaineer, rear.
  • Fits 2003-2005 Lincoln Aviator, rear.
  • Fits 2003 Ford Explorer Sport, rear.
  • Fits 2002 Ford Explorer, rear. Compatible with HVAC Blend Door Actuator models manufactured from March 2002.
  • Fits 2002 Ford Explorer Sport, rear. Compatible with HVAC Blend Door Actuator models manufactured from March 2002.
  • Fits 2002 Ford Explorer Sport Trac, rear. Compatible with HVAC Blend Door Actuator models manufactured from March 2002.

What It Helps Fix

  • Rear A/C cooling loss caused by a leaking or restricted evaporator core
  • Refrigerant odor from corrosion or internal core damage
  • Uneven rear cabin temperature in Ford Explorer and Mountaineer HVAC systems
  • Low airflow performance caused by a clogged evaporator assembly
  • Service replacement needs after rear HVAC system contamination or failure

Installation Notes

Verify the inlet and outlet fitting styles, core dimensions, and rear HVAC configuration before installation. Confirm vehicle year, model, and the March 2002 blend door actuator note where applicable on 2002 Explorer, Explorer Sport, and Explorer Sport Trac applications. Replace any disturbed sealing components as required by the service procedure and evacuate, recharge, and leak-check the system after installation.

Quality Assurance

Four Seasons catalogs this part as an evaporator core for rear HVAC service replacement. Part number 54891 is listed with OE-style dimensions, aluminum construction, and application-specific fitment for the vehicles shown above.

Related reading

This part fits 28 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2010FordExplorerRearEvaporator Core
2010FordExplorer Sport TracRearEvaporator Core
2010MercuryMountaineerRearEvaporator Core
2009FordExplorerRearEvaporator Core
2009FordExplorer Sport TracRearEvaporator Core
2009MercuryMountaineerRearEvaporator Core
2008FordExplorerRearEvaporator Core
2008MercuryMountaineerRearEvaporator Core
2007FordExplorerRearEvaporator Core
2007MercuryMountaineerRearEvaporator Core
2006FordExplorerRearEvaporator Core
2006MercuryMountaineerRearEvaporator Core
2005FordExplorerRearEvaporator Core
2005FordExplorer Sport TracRearEvaporator Core
2005LincolnAviatorRearEvaporator Core
2005MercuryMountaineerRearEvaporator Core
2004FordExplorerRearEvaporator Core
2004FordExplorer Sport TracRearEvaporator Core
2004LincolnAviatorRearEvaporator Core
2004MercuryMountaineerRearEvaporator Core
2003FordExplorerRearEvaporator Core
2003FordExplorer SportRearEvaporator Core
2003FordExplorer Sport TracRearEvaporator Core
2003LincolnAviatorRearEvaporator Core
2003MercuryMountaineerRearEvaporator Core
2002FordExplorerRearCompatible with HVAC Blend Door Actuator models manufactured from March 2002.; Evaporator Core
2002FordExplorer SportRearCompatible with HVAC Blend Door Actuator models manufactured from March 2002.; Evaporator Core
2002FordExplorer Sport TracRearCompatible with HVAC Blend Door Actuator models manufactured from March 2002.; Evaporator Core
Directly replaces or cross-references 26 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 54891Global Parts Distributors LLC — 4711877Spectra Premium — 1010002UAC — EV939682PFC1L2Z19860BA4L2Z19860CA6L2Z19860CA6L2Z19860CB6L2Z19860DA6L2Z19860EA6L2Z19860EB6019928845177116501476734156277227332603771165111548911919136989000049A88451CWK771165EP11079T54891YK213