--- title: "Subaru HVAC Blend Door Actuator Split Gear" slug: "subaru-blend-door-actuator-gear-72131-fg000" oem_part_number: "72131-FG000" superseded_numbers: - "72131-FG001" - "72131-FG002" - "72131-FG003" compatible_vehicles_and_appliances: - make: "Subaru" model: "Impreza" year_start: 2008 year_end: 2014 - make: "Subaru" model: "WRX / STI" year_start: 2008 year_end: 2014 - make: "Subaru" model: "Forester" year_start: 2009 year_end: 2013 - make: "Subaru" model: "XV Crosstrek" year_start: 2013 year_end: 2017 material: "Nylon PA12" price_cents: 1699 price_formatted: "$16.99 USD" is_commercial_allowed: true license: "CC BY 4.0" download_stl_url: "https://barebones3d.com/assets/stl/subaru-blend-door-actuator-gear-72131-fg000.stl" checkout_api_url: "https://barebones3d.com/api/checkout/create" canonical_guide_url: "https://barebones3d.com/guides/subaru-blend-door-actuator-gear-72131-fg000" --- # Subaru HVAC Blend Door Actuator Split Gear (OEM #72131-FG000) ## Technical Specifications - **Primary OEM Part #:** `72131-FG000` - **Engineering Material:** Nylon PA12 (100% solid infill, calibrated printer compensation) - **Repair Difficulty:** Moderate - **Estimated Repair Time:** 45 mins - **Commercial Purchase:** $16.99 USD (Printed on-demand in 48h via Slant 3D) - **Direct STL Download:** [72131-FG000.stl](https://barebones3d.com/assets/stl/subaru-blend-door-actuator-gear-72131-fg000.stl) ## Required Tools & Supplies - **Phillips #2 Screwdriver**: Glove box trim screws - **Plastic Trim Pry Tool**: Lower dash kick panel clips - **7mm Hex Socket & Driver**: Actuator motor mounting bolts - **White Lithium Grease**: Gear teeth lubrication ## Step-by-Step Installation Procedure ### Step 1: Lower Dash & Glovebox Removal Depress the side damper clips inside the passenger glovebox. Unscrew the two lower pivot screws using a #2 Phillips screwdriver. Gently pull downward to release the assembly without stressing the nylon hinges. > **Pro Tip:** Place screws into an organizer tray to avoid mixing up trim screws with chassis ground screws. ![Original broken plastic Subaru HVAC Blend Door Actuator Split Gear (OEM #72131-FG000) shown side-by-side with reinforced 3D printed Nylon PA12 reproduction.](https://barebones3d.com/assets/parts/72131-fg000-subaru-blend-door-actuator-gear-72131-fg000-step-1.webp) ### Step 2: Locate HVAC Blend Door Actuator Look to the left of the cabin air filter cavity on the HVAC climate box. You will see a small black plastic servo motor box secured by three 7mm hex bolts. > **Caution:** Do not force the blend door linkage arm by hand while the motor is plugged in to avoid stripping the interior potentiometer. ![Original broken plastic Subaru HVAC Blend Door Actuator Split Gear (OEM #72131-FG000) shown side-by-side with reinforced 3D printed Nylon PA12 reproduction.](https://barebones3d.com/assets/parts/72131-fg000-subaru-blend-door-actuator-gear-72131-fg000-step-2.webp) ### Step 3: Unclip Wire Harness & Extract Actuator Depress the locking tab on the 5-pin wiring connector and extract it. Remove the three 7mm bolts and lift the actuator motor straight outward from the HVAC casing. ![Original broken plastic Subaru HVAC Blend Door Actuator Split Gear (OEM #72131-FG000) shown side-by-side with reinforced 3D printed Nylon PA12 reproduction.](https://barebones3d.com/assets/parts/72131-fg000-subaru-blend-door-actuator-gear-72131-fg000-step-3.webp) ### Step 4: Open Actuator Case & Swap Split Gear Pry the four perimeter casing clips with a flat tool. The OEM white nylon spur gear will likely show a hairline fracture along the D-bore shaft. Clean out old dried grease, apply fresh white lithium grease, and press the new Barebones 3D PA12 Nylon gear onto the metal drive shaft. > **Pro Tip:** Nylon PA12 provides self-lubricating qualities and higher shear strength than standard injection-molded POM. ![Original broken plastic Subaru HVAC Blend Door Actuator Split Gear (OEM #72131-FG000) shown side-by-side with reinforced 3D printed Nylon PA12 reproduction.](https://barebones3d.com/assets/parts/72131-fg000-subaru-blend-door-actuator-gear-72131-fg000-step-4.webp) ### Step 5: Re-indexing & Functional Climate Test Snap the casing together, re-seat onto the HVAC box spline, reconnect the 5-pin plug, and turn vehicle ignition to ON. Cycle cabin temperature from Cold (60°F) to Hot (85°F) to verify smooth, quiet flap travel before reinstalling the glovebox. ![Original broken plastic Subaru HVAC Blend Door Actuator Split Gear (OEM #72131-FG000) shown side-by-side with reinforced 3D printed Nylon PA12 reproduction.](https://barebones3d.com/assets/parts/72131-fg000-subaru-blend-door-actuator-gear-72131-fg000-step-5.webp) ## Frequently Asked Questions #### Q: Why does the OEM Subaru gear fail? **A:** The OEM gear was molded from brittle unreinforced POM with an undersized wall thickness around the drive D-flat. Cyclic thermal expansion between winter heating and summer A/C causes radial hoop stress cracking. #### Q: Why is Nylon PA12 specified instead of PLA or PETG? **A:** Automotive under-dash temperatures can exceed 70°C in direct summer sunlight. PLA deforms at 55°C. PA12 Nylon has a heat deflection temperature of over 110°C, high impact resistance, and natural lubricity. #### Q: Does this part require special slicer tolerances? **A:** The free STL is engineered with a +0.15mm printer tolerance compensation for FDM. If printing on a Bambu or Prusa, slice at 0.12mm layer height and 100% infill. ## Open-Source Attribution & Safety Disclaimer Designed by SubieFix & Engineering Archive, distributed under CC BY 4.0. Original Source: https://www.printables.com/model/subaru-blend-door-gear > **Legal Disclaimer:** Barebones 3D, L.L.C. is an independent engineering firm. This replacement component is an aftermarket reproduction designed for personal repair, restoration, and life-extension. Barebones 3D is not affiliated with, authorized by, sponsored by, or endorsed by the original equipment manufacturer. All trademarks and OEM part numbers are referenced solely for identification and compatibility purposes.