Mode Door Actuator

This procedure covers the removal and replacement of the HVAC mode door actuator, which controls airflow distribution in the cabin heating and cooling system.

Warnings

Tools required

Parts

• Mode door actuator × 1 — Use OEM specification
• Dashboard trim clips × 1 — Replacement clips as needed
• Actuator mounting screws × 1 — Use OEM specification if damaged

Preparation

1. Park vehicle on level surface and engage parking brake
2. Power down vehicle completely and wait 30 minutes for all systems to deenergize
3. Disconnect 12V battery negative terminal located in front trunk area
4. Set HVAC controls to defrost mode before powering down (makes actuator access easier)
5. Remove lower driver side dashboard knee bolster panel
6. Take photos of all connector locations and panel positions before removal

Procedure

1. 1

   Remove lower dashboard panels
   Using plastic trim tools, carefully pry out the lower dashboard trim panel below the steering column. Start from the bottom edge and work around the perimeter. Remove four T20 Torx screws securing the knee bolster panel and lower it away from the dashboard structure. Disconnect any electrical connectors for courtesy lights or switches.
2. 2

   Remove driver side foot duct
   Locate the HVAC foot duct on the driver side. Remove two 7mm screws securing the duct to the HVAC housing. Gently pull the duct forward and down to disconnect it from the main HVAC plenum. Set aside in a clean area.
3. 3

   Access HVAC control module area
   Remove the lower instrument panel cover on the driver side by removing six 10mm bolts. This exposes the HVAC control module housing behind the center stack. You may need to lower the steering column to its lowest position for better access.
4. 4

   Disconnect HVAC electrical connectors
   Locate the HVAC control module mounted to the side of the HVAC housing. Identify and label all electrical connectors. Press the locking tabs and carefully disconnect the main control module connector and any auxiliary connectors. Note the routing of wiring harnesses.
5. 5

   Remove HVAC control module
   Remove three T20 Torx screws securing the HVAC control module to its mounting bracket. Carefully pull the module away from the HVAC housing to access the mode door actuator mounted behind it. The actuator is typically located on the upper left side of the main HVAC plenum.
6. 6

   Locate mode door actuator
   Using a flashlight, identify the mode door actuator. It is a small rectangular motor with a gear shaft protruding from one end that connects to the mode door linkage. The actuator will have an electrical connector with a locking tab and is secured by two or three small screws.
7. 7

   Disconnect actuator electrical connector
   Press the locking tab on the actuator electrical connector and carefully pull it straight off the actuator. The connector may be tight due to its location. Use gentle wiggling motion if needed, but do not force it.
8. 8

   Remove actuator mounting screws
   Remove the two or three 7mm screws securing the actuator to the HVAC housing. Use a magnetic pickup tool to prevent screws from falling into the HVAC plenum. Note the orientation of the actuator and position of the gear shaft before removal.
9. 9

   Disconnect actuator from mode door
   Carefully rotate the actuator counterclockwise while pulling it away from the housing to disengage the gear shaft from the mode door linkage. The shaft has a D-shaped connection that requires proper alignment. Inspect the mode door linkage for any damage or binding.
10. 10

    Install new actuator
    Position the new actuator near the mode door linkage opening. Align the D-shaped gear shaft with the linkage socket. The actuator should be in its default position (typically full defrost). Gently press and rotate the actuator clockwise to engage the shaft fully with the linkage, then align mounting holes.
11. 11

    Secure new actuator
    Install the mounting screws and tighten evenly to secure the actuator to the HVAC housing. Do not overtighten as the housing is plastic. Reconnect the electrical connector, ensuring the locking tab clicks into place. Verify the connection is secure by gently tugging on the connector.
12. 12

    Reinstall HVAC control module
    Position the HVAC control module back onto its mounting bracket. Install the three T20 Torx screws to secure it. Reconnect all electrical connectors to the control module, ensuring each locking tab engages properly. Double-check that no wires are pinched or strained.
13. 13

    Perform actuator calibration
    Reconnect the 12V battery. Power up the vehicle and access the service mode menu through the center display or using Rivian diagnostic software. Navigate to HVAC system and perform mode door actuator calibration. The system will cycle the actuator through all positions to establish reference points. Listen for smooth operation without clicking or binding.
14. 14

    Reinstall dashboard components
    Reinstall the foot duct, ensuring it seats properly in the HVAC plenum. Install the 7mm screws. Reinstall the lower instrument panel cover and secure with the 10mm bolts. Reconnect any electrical connectors for lights or switches. Install the knee bolster panel and lower trim pieces, ensuring all clips engage properly.

Reassembly

1. Verify all electrical connectors are properly seated and locked
2. Ensure all dashboard panels are aligned properly before pressing clips into place
3. Check that no tools or parts were left in the HVAC plenum or dashboard cavity
4. Verify all screws and fasteners have been reinstalled
5. Confirm 12V battery is properly reconnected with clean, tight connections

Verification

• Power up the vehicle and access the HVAC controls on the center display
• Cycle through all mode settings (defrost, floor, panel, bi-level) and listen for smooth actuator operation without grinding or clicking
• Verify airflow changes direction appropriately for each mode selection
• Place hand in front of each vent location to confirm airflow redirects as expected
• Check for any air leaks around the dashboard or foot ducts
• Verify no warning lights or HVAC system errors appear on the instrument cluster
• Test HVAC system in both heating and cooling modes to ensure proper operation
• Confirm all dashboard panels are secure with no rattles or loose trim pieces

More procedures for this vehicle