Four Seasons 73479 HVAC Blend Door

Four Seasons HVAC Blend Door Kit 73479

Four Seasons 73479 is a replacement HVAC blend door for temperature control repair in select Ford trucks and SUVs. It is built from plastic and measures 8.25 in. long, 4.5 in. high, and 0.5 in. wide for the specified blend-door application.

The Four Seasons HVAC Blend Door Kit line focuses on direct-fit temperature control components for service work in the HVAC case. This part number, 73479, is listed for Ford Excursion, Ford F-250 Super Duty, Ford F-350 Super Duty, and Ford F-250 applications where the blend door is the failed component.

• Replacement door for HVAC blend function
• Plastic construction
• Dimensions: 8.25 in. L x 4.5 in. H x 0.5 in. W
• Direct replacement for select Ford HVAC blend door repairs
• Cross-reference part numbers include 4C4Z18471BA and F81Z18471BA

Detailed Product Information

Four Seasons 73479 is a blend door used in the HVAC temperature control system to direct air through the proper heating and cooling paths. It is specified as a replacement door and is identified for blend-door service in 1999 Ford F-250, 1999-2004 Ford F-250 Super Duty, 1999-2004 Ford F-350 Super Duty, and 2000-2005 Ford Excursion applications. For Excursion models, the listing notes w/o ATC (Automatic Temperature Control) and installation through the glove box area. For the Super Duty and F-250 listings, the notes identify the door only configuration.

Use Four Seasons 73479 when the original blend door is cracked, broken, or no longer moving correctly inside the HVAC housing. This part number is also searched as 73479 for Ford F-250 Super Duty and Ford F-350 Super Duty blend door repair, as well as Ford Excursion HVAC temperature control service.

• Broken or cracked HVAC blend door
• Improper air temperature mixing between hot and cold
• Loss of cabin temperature control
• HVAC case movement issues caused by a damaged door
• Service repair for select Ford F-250, F-250 Super Duty, F-350 Super Duty, and Excursion models

Installation Notes and Tips

Verify the vehicle year, model, and HVAC configuration before installation. The fitment notes for 2000-2005 Ford Excursion specify w/o ATC and installation through the glove box area, while the truck applications are listed as door only. Confirm the existing blend-door style and access path inside the HVAC housing before disassembly.

Quality Assurance

Four Seasons supplies HVAC temperature control components for service replacement applications. Part number 73479 is cataloged with defined dimensions, material, and vehicle-specific fitment data to support accurate ordering for the listed Ford applications.