Four Seasons 73787 HVAC Mode Door Actuator - Main
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Four Seasons

Four Seasons 73787 HVAC Mode Door Actuator - Main

Brand Four Seasons 73787
Position Main
Door Linkage Male
Mounting Ear Qty. 2
Style Hvac air door actuator
Terminal Pin Qty. 0
Fits Ford and Mercury · 40 vehicles

Air door actuator. Controls HVAC mode and defrost airflow routing.

Direct replacement. Built for the specified linkage and mounting layout.

Trusted experience. Backed by over 50 years of mobile A/C expertise.

Cross-references Four Seasons 73787, 7L5Z18A318B and F5TZ18A318B for the same application. See all 4.

$43.66Free shipping
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HVAC Mode Door Actuator Overview

Four Seasons 73787 is an HVAC mode door actuator for defrost control in select Ford and Mercury applications. It is built for direct replacement use where the air door actuator needs to restore proper airflow routing through the climate system.

Key Features

  • HVAC air door actuator style for mode and defrost control
  • Male door linkage for the specified application
  • Two mounting ears for secure installation
  • Engineered and tested for long service life
  • Four Seasons part number 73787 for easy identification

Detailed Description

This Four Seasons HVAC mode door actuator is used to control the position of the air door in the heating and air conditioning system. In Ford Ranger, Ford Explorer, Ford Explorer Sport Trac, Ford Explorer Sport, Ford F-100 Ranger, and Mercury Mountaineer applications, it supports defrost operation by moving the mode door as required by the system. The Four Seasons 73787 designation helps confirm the correct replacement when servicing a failed actuator in these vehicles.

Four Seasons draws on more than 50 years of mobile A/C experience, and this actuator is engineered and tested to deliver dependable operation in the HVAC system. This part cross-references Ford and Mercury applications such as 7L5Z18A318B and F5TZ18A318B for the same application.

Common Problems It Can Solve

  • Defrost airflow stuck in the wrong outlet
  • Inconsistent HVAC mode changes
  • Air door movement failure inside the climate system
  • Loss of proper defrost function

Installation Notes and Tips

Verify the connector style, linkage type, and mounting ear layout before installation. Confirm the vehicle uses the listed defrost application and match the part number 73787 to the original unit for proper fitment. Professional HVAC service procedures may be required to access the actuator.

Quality Assurance

Four Seasons backs this actuator with engineering and testing focused on trouble-free operation, supported by over 50 years of mobile A/C experience.

Related reading

This part fits 40 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelPositionNotes
2011FordRangerN/ADefrost
2010FordRangerN/ADefrost
2009FordRangerN/ADefrost
2008FordRangerN/ADefrost
2007FordRangerN/ADefrost
2006FordRangerN/ADefrost
2005FordExplorer Sport TracN/ADefrost
2005FordRangerN/ADefrost
2004FordExplorer Sport TracN/ADefrost
2004FordRangerN/ADefrost
2003FordExplorer SportN/ADefrost
2003FordExplorer Sport TracN/ADefrost
2003FordRangerN/ADefrost
2002FordExplorer SportN/ADefrost
2002FordExplorer Sport TracN/ADefrost
2002FordRangerN/ADefrost
2001FordExplorerMainDefrost
2001FordExplorer SportN/ADefrost
2001FordExplorer Sport TracN/ADefrost
2001FordF-100 RangerN/ADefrost
2001FordRangerN/ADefrost
2001MercuryMountaineerMainDefrost
2000FordExplorerN/ADefrost
2000FordF-100 RangerN/ADefrost
2000FordRangerN/ADefrost
2000MercuryMountaineerN/ADefrost
1999FordExplorerN/ADefrost
1999FordF-100 RangerN/ADefrost
1999FordRangerN/ADefrost
1999MercuryMountaineerN/ADefrost
1998FordExplorerN/ADefrost
1998FordF-100 RangerN/ADefrost
1998FordRangerN/ADefrost
1998MercuryMountaineerN/ADefrost
1997FordF-100 RangerN/ADefrost
1997FordRangerN/ADefrost
1997MercuryMountaineerN/ADefrost
1996FordF-100 RangerN/ADefrost
1996FordRangerN/ADefrost
1995FordRangerN/ADefrost
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Four Seasons — 737877L5Z18A318BF5TZ18A318BMT7402