Four Seasons 73478 HVAC Blend Door

Overview of Four Seasons HVAC Blend Door Kit 73478

The Four Seasons HVAC Blend Door Kit 73478 is a precise replacement part designed for Ford and Mercury vehicles, including the Explorer, Explorer Sport Trac, and Mountaineer models. This blend door controls the mix of hot and cold air within the HVAC system to maintain the desired cabin temperature.

• Replacement HVAC blend door for temperature control
• Compatible with Ford Explorer, Explorer Sport Trac, and Mercury Mountaineer
• Durable plastic construction measuring 8.25 inches in length and 5.75 inches in height
• Part number 73478 ensures exact fit and function
• Width of 0.625 inches for proper integration within HVAC assembly

Detailed Product Description and Specifications

This HVAC blend door from Four Seasons is crafted from sturdy plastic material, providing reliable performance and longevity. The component measures 8.25 inches (210 mm) in length, 5.75 inches (146 mm) in height, and 0.625 inches (15.87 mm) in width, dimensions that ensure compatibility with the HVAC systems of select Ford and Mercury vehicles. The blend door functions by regulating airflow between the heater core and the air conditioning evaporator, allowing precise temperature control inside the vehicle cabin.

About the HVAC Blend Door Kit Product Line

The HVAC Blend Door Kit product line by Four Seasons focuses on replacement components that restore proper temperature control functionality in vehicle HVAC systems. This line includes blend doors engineered to meet OEM specifications, ensuring seamless integration and consistent climate control performance. The 73478 part is part of this line, designed specifically for Ford Explorer, Explorer Sport Trac, and Mercury Mountaineer models.

Common Issues Resolved by This Blend Door

• Inconsistent cabin temperature due to blend door failure
• Unresponsive HVAC temperature controls
• Unusual noises from the HVAC system when adjusting temperature
• Airflow stuck on hot or cold settings
• Reduced HVAC system efficiency and comfort

Installation Notes and Tips

• Ensure vehicle compatibility with Ford Explorer, Explorer Sport Trac, or Mercury Mountaineer before installation
• Carefully remove the old blend door to avoid damaging surrounding HVAC components
• Verify the new blend door’s dimensions (8.25" x 5.75" x 0.625") match the original part
• Follow manufacturer guidelines for reassembly to maintain proper HVAC function

Quality Assurance and Warranty

Four Seasons manufactures the HVAC Blend Door Kit 73478 to meet industry standards for durability and performance. The plastic construction is designed to withstand typical HVAC system conditions. While specific warranty details are not provided here, Four Seasons products generally come with a limited warranty covering defects in material and workmanship.