This procedure covers the removal and replacement of the blower motor control module, which regulates HVAC blower motor speed in the 2023 Chevrolet Bolt EUV.

Warnings

Tools required

Parts

• Blower Motor Control Module × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and apply parking brake
2. Ensure vehicle has been off for at least 10 minutes
3. Open driver's door to prevent lockout
4. Locate the 12V battery in the engine compartment
5. Disconnect the negative (-) 12V battery terminal and secure cable away from terminal
6. Wait at least 2 minutes for system capacitors to discharge

Procedure

1. 1

   Access passenger side lower dashboard area
   Position yourself in the front passenger footwell. The blower motor control module is located behind the lower right side of the dashboard, above the passenger footwell area. You may need to lower the passenger seat fully back for better access.
2. 2

   Remove lower dashboard trim panel
   Locate and remove the lower passenger side dashboard trim panel. This panel is typically held in place by plastic clips and may have 2-3 screws. Carefully pull the panel away from the dashboard starting at the bottom edge, releasing the retaining clips. Set the panel aside in a safe location.
3. 3

   Locate the blower motor control module
   With the trim panel removed, locate the blower motor control module mounted to the HVAC housing. It is a rectangular electronic module with a multi-pin electrical connector attached. Use a work light to clearly see the mounting location and connector.
4. 4

   Disconnect electrical connector
   Locate the locking tab on the electrical connector attached to the blower motor control module. Press or slide the tab to release the lock, then carefully pull the connector straight off the module. Do not pull on the wires themselves. Note the orientation of the connector for reinstallation.
5. 5

   Remove module mounting fasteners
   Remove the mounting screws or bolts securing the blower motor control module to the HVAC housing. Typically there are 2-3 fasteners. Keep these fasteners organized for reinstallation.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
6. 6

   Remove old blower motor control module
   Carefully pull the blower motor control module away from the HVAC housing. You may need to maneuver it slightly to clear the mounting area. Inspect the mounting area and connector for any signs of corrosion, debris, or damage.
7. 7

   Install new blower motor control module
   Position the new blower motor control module into the mounting location, ensuring it is properly oriented and seated flush against the HVAC housing. The mounting holes should align with the mounting points on the housing.
8. 8

   Install and torque mounting fasteners
   Install the module mounting bolts or screws finger-tight first, then torque them evenly to specification using a torque wrench. Do not over-torque as this can damage the module housing or HVAC case.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
9. 9

   Reconnect electrical connector
   Align the electrical connector with the terminal on the blower motor control module and push it on firmly until you hear or feel the locking tab click into place. Gently tug on the connector to verify it is fully locked.
10. 10

    Reinstall lower dashboard trim panel
    Position the lower dashboard trim panel back into place. Align the clips with their receptacles and press firmly until all clips are fully seated. Install any screws that were removed and tighten securely, but do not over-torque plastic trim screws.
11. 11

    Reconnect 12V battery
    Reconnect the negative (-) terminal to the 12V battery. Torque the battery terminal bolt to specification. Ensure the connection is clean and secure.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Ensure all trim panels are fully seated and secured
2. Verify all electrical connectors are fully locked
3. Double-check that no tools or parts were left in the dashboard area
4. Reset the passenger seat to normal position if adjusted

Verification

• Turn the vehicle to ON mode (do not start - press brake and power button without holding)
• Turn the HVAC system on and test all blower motor speed settings from low to high
• Verify smooth operation at all speed settings with no unusual noises
• Confirm airflow increases appropriately with each higher speed setting
• Test in both fresh air and recirculation modes
• Check for any diagnostic trouble codes using the vehicle information center or scan tool
• Verify no warning lights are illuminated on the dashboard related to HVAC systems

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