Four Seasons 73478 HVAC Blend Door
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Four Seasons
 HVAC Blend Door Kit

Four Seasons 73478 HVAC Blend Door

Brand Four Seasons 73478
Description Replacement Door
Function BLEND
Height IN 5.75
Height MM 146
Length IN 8.25
Length MM 210
Material PLASTIC
Width IN 0.625
Width MM 15.87
Product line HVAC Blend Door Kit
Fits Ford and Mercury · 5 vehicles

Replacement door. For HVAC blend door service and temperature control repairs.

Plastic construction. Lightweight replacement part for dependable HVAC operation.

Blend function. Supports precise airflow mixing inside the HVAC system.

Cross-references Four Seasons 73478, 6L2Z18B259AA and 6L2Z18B259AC for the same application. See all 8.

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HVAC Blend Door Replacement for Ford and Mercury

Restore proper cabin temperature control with this Four Seasons HVAC Blend Door Kit, part number 73478. This replacement door is built for blend-function HVAC systems and is sized for direct service in the heater and air distribution assembly.

Compatible with 2006-2007 Ford Explorer, 2007 Ford Explorer Sport Trac, and 2006-2007 Mercury Mountaineer applications that use glove-box-area access. Four Seasons 73478 is a plastic replacement door made to match the original blend-door function for these vehicles.

Key Features

  • Brand: Four Seasons HVAC Blend Door Kit
  • Part number: 73478
  • Function: Blend
  • Replacement door construction
  • Material: Plastic
  • Dimensions: 8.25 in. length, 5.75 in. height, 0.625 in. width
  • Metric dimensions: 210 mm length, 146 mm height, 15.87 mm width

Product Details

The Four Seasons HVAC Blend Door Kit 73478 is a replacement door for temperature-control systems that route air through the blend door inside the HVAC housing. It is intended for vehicles serviced through the glove box area and is listed for 2006-2007 Ford Explorer, 2007 Ford Explorer Sport Trac, and 2006-2007 Mercury Mountaineer models. This part cross-references OE-style numbers such as 6L2Z18B259AA and 6L2Z18B259AC for the same application.

Common Issues This Part May Address

  • Inconsistent cabin temperature from the vents
  • Air stuck on hot or cold settings
  • Improper air mixing inside the HVAC case
  • Broken or worn blend door movement
  • HVAC temperature control response problems

Installation Notes and Tips

Installation is through the glove box area on the listed Ford Explorer, Explorer Sport Trac, and Mercury Mountaineer applications. Verify the vehicle year and HVAC configuration before service, and compare the original door dimensions and mounting points to the replacement part number 73478 before installation.

Quality Assurance

Four Seasons supplies HVAC service parts for temperature-control repair applications, and this blend door is built as a replacement component for the listed fitments. Confirm the OE cross-reference and vehicle application before ordering to ensure proper match.

Related reading

This part fits 5 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2007FordExplorerN/ATo 12/06; Installed Through Glove Box Area; HVAC Blend Door Kit
2007FordExplorer Sport TracN/ATo 12/06; Installed Through Glove Box Area; HVAC Blend Door Kit
2007MercuryMountaineerN/ATo 12/06; Installed Through Glove Box Area; HVAC Blend Door Kit
2006FordExplorerN/AInstalled Through Glove Box Area; HVAC Blend Door Kit
2006MercuryMountaineerN/AInstalled Through Glove Box Area; HVAC Blend Door Kit
Directly replaces or cross-references 8 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 734786L2Z18B259AA6L2Z18B259AC7L2Z18B259A902224A60478BDDB1005DA1374