AA Ignition Rear HVAC Blend Door Actuator for Ford/Lincoln/Mercury SUVs — Rear Right, Cross-Shaped Shaft, Reinforced Circuit Board

AA Ignition Rear HVAC Air Blend Door Actuator (604-213 / 1L2Z19E616BA) is a direct-fit replacement that restores proper mode and temperature control in the rear HVAC of compatible Ford, Lincoln and Mercury SUVs.

If your Expedition, Explorer, Navigator, Mountaineer or Aviator is making clicking noises or failing to deliver correct heater or AC temperatures to the rear cabin, the rear blend door actuator is a common culprit. This AA Ignition unit replaces the factory actuator used in many 2002–2017 models and is built with a reinforced housing and improved circuit board to resist heat, vibration and corrosion for longer service life.

How will this actuator fix clicking, popping or incorrect rear temperatures?

When the internal gears or motor of the original actuator wear out, the mode door can stick or move improperly, producing noises and wrong airflow or temperature. Installing this replacement restores precise movement of the cross-shaped shaft and corrects airflow pathways so vents deliver the expected heat or cooling.

• Directly replaces failed blend door actuator in the rear right panel
• Cross-shaped shaft fits vehicles that use that mounting style
• Redesigned internal board reduces heat- and vibration-related failures
• Eliminates clicking/popping and restores proper vent actuation

Which vehicles and part numbers is this compatible with?

This actuator is compatible with select Ford, Lincoln and Mercury SUVs built between 2002 and 2017. It replaces several OE numbers—confirm the cross-shaped shaft style before ordering to ensure fitment.

• Fits: Expedition, Explorer, Navigator, Mountaineer, Aviator (model years listed)
• Replaces: 604-213, YH-1743, 1L2Z19E616BA, 2L2H19E616AA
• Installed in the rear right HVAC panel of the vehicle
• Check shaft shape: cross-shaped required (not D-shaped)

What should I expect during installation and durability?

Installation is straightforward for DIYers: remove the rear right panel housing to access the actuator—no specialty tools are typically required. The AA Ignition unit features improved housing and circuitry designed to outlast many factory actuators used in these SUVs.

• Simple access behind the rear right panel—panel removal required
• No special tools usually needed for replacement
• Durable housing and rugged internal board for extended life
• Lifetime warranty for replacement if it fails

Will this part save me money versus a dealer repair?

Yes—buying this replacement and performing the swap yourself avoids dealer labor costs and expensive OEM pricing. The lifetime warranty provides added protection so you can save on parts and service over time.

• Lower cost than dealer-supplied OEM part
• Lifetime warranty for peace of mind
• Commonly a quick DIY fix, reducing labor expense
• Replacement restores HVAC function without full system overhaul

Who is this for: Owners and technicians of Ford, Lincoln or Mercury SUVs (including Expedition, Explorer, Navigator, Mountaineer and Aviator) who are experiencing rear HVAC mode or temperature failures, clicking noises from the rear HVAC area, or incorrect airflow. This part is aimed at buyers who need a direct-fit, more durable aftermarket actuator with a lifetime warranty and who will check shaft shape (cross-shaped) for proper fitment before installation.