Blower Motor Resistor

This procedure covers the removal and replacement of the HVAC blower motor resistor on a 2023 Rivian EDV 500, which controls blower motor speed.

Warnings

Tools required

Parts

• Blower motor resistor module × 1 — Use OEM Rivian specification
• Push-pin fasteners (if damaged) × 5 — Use OEM specification

Preparation

1. Park the vehicle on a level surface and ensure it is completely powered off
2. Disconnect the 12-volt low-voltage battery located in the front storage compartment
3. Wait at least 5 minutes for all electrical systems to fully discharge
4. Set the parking brake and ensure the vehicle is in Park mode
5. Gather all necessary tools and the replacement blower motor resistor
6. Remove any floor mats or obstructions from the passenger footwell area

Procedure

1. 1

   Remove passenger side lower dash panel
   Locate the lower trim panel on the passenger side beneath the glove compartment. Using trim panel removal tools, carefully pry out the plastic push-pin fasteners securing the lower dash panel. There are typically 6-8 fasteners. Work slowly to avoid breaking the clips. Once all fasteners are released, gently pull the panel away and disconnect any electrical connectors if present.
2. 2

   Access the HVAC unit area
   With the lower panel removed, use your flashlight to locate the HVAC unit housing. The blower motor resistor is typically mounted on the side or bottom of the HVAC case on the passenger side. You may need to remove additional insulation or sound dampening material to gain clear access. Look for a rectangular module with a wiring harness connector.
3. 3

   Locate the blower motor resistor
   Identify the blower motor resistor module. It will be a small rectangular component with a multi-pin electrical connector and typically 2-3 mounting screws. The resistor may have cooling fins or a heat sink visible. Note the orientation and position for reinstallation. Take a photo if needed for reference.
4. 4

   Disconnect the electrical connector
   Locate the wiring harness connector attached to the blower motor resistor. Press the locking tab or release mechanism on the connector and carefully pull it straight away from the resistor module. Do not pull on the wires themselves. Inspect the connector pins for any signs of corrosion or heat damage.
5. 5

   Remove resistor mounting fasteners
   Using the appropriate Torx T20 or 7mm socket, remove the mounting screws securing the blower motor resistor to the HVAC case. There are typically 2-3 screws. Keep these screws in a safe location as they will be reused. Support the resistor module as you remove the final screw to prevent it from falling.
6. 6

   Remove the old blower motor resistor
   Carefully pull the blower motor resistor module away from the HVAC case. It may have a seal or gasket that creates slight resistance. Wiggle gently if needed but avoid forcing it. Once removed, inspect the mounting area for any debris, corrosion, or damage to the HVAC case.
7. 7

   Inspect and clean the mounting area
   Examine the HVAC case where the resistor was mounted. Clean any dust, debris, or old gasket material from the mounting surface. Check the air duct opening to ensure there are no obstructions. Verify that the mounting screw holes are intact and not stripped.
8. 8

   Prepare the new blower motor resistor
   Remove the new blower motor resistor from its packaging. Verify it matches the old unit in connector type, mounting hole pattern, and overall dimensions. If a new seal or gasket is included, ensure it is properly positioned on the new resistor before installation.
9. 9

   Install the new blower motor resistor
   Align the new blower motor resistor with the mounting holes on the HVAC case. Ensure any seal or gasket is properly seated. Insert the resistor into position, making sure it sits flush against the mounting surface. Hold it in place while preparing to install the mounting screws.
10. 10

    Secure the resistor with mounting fasteners
    Install the mounting screws and tighten them in a cross-pattern to ensure even seating. Tighten screws firmly but do not overtighten as the HVAC case may be plastic. Ensure the resistor module is secure and does not move when gently pulled.
11. 11

    Reconnect the electrical connector
    Align the wiring harness connector with the pins on the new blower motor resistor. Push the connector firmly onto the resistor until you hear or feel a distinct click indicating the locking tab has engaged. Gently tug on the connector to verify it is securely locked in place.
12. 12

    Reinstall the lower dash panel
    Reconnect any electrical connectors to the lower dash panel if applicable. Position the panel back into place, aligning all mounting points. Press firmly to engage the push-pin fasteners, or install new fasteners if any were damaged during removal. Ensure all edges are flush and the panel is secure.
13. 13

    Reconnect the low-voltage battery
    Return to the front storage compartment and reconnect the 12-volt low-voltage battery. Ensure the connection is tight and secure. Close the battery compartment cover.

Reassembly

1. Verify all trim panels are securely fastened with no gaps or loose sections
2. Ensure no tools or parts were left in the passenger footwell or behind the dash
3. Replace any floor mats or items that were removed from the passenger area
4. Check that all electrical connections are secure and properly routed

Verification

• Power on the vehicle and access the HVAC controls on the center display
• Test all blower motor speed settings from low to high, verifying smooth operation at each level
• Listen for any unusual noises from the blower motor area during operation
• Verify that airflow corresponds appropriately to each speed setting
• Check that there are no error messages or warnings related to the HVAC system on the instrument cluster
• Allow the blower to run for several minutes at various speeds to ensure the resistor is functioning properly and not overheating
• Verify climate control operates normally in all modes (heat, cool, defrost)

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