Replace the blower motor control module (also called final stage resistor or blower motor resistor) located in the HVAC system to restore proper climate control fan speed operation.

Warnings

Tools required

Parts

• Blower motor control module (final stage resistor) × 1 — Mopar 68105866AA or equivalent
• Dielectric grease × 1 — Small packet for connector protection

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition off and remove key from vehicle
3. Open passenger door for workspace access
4. Allow HVAC system to cool completely if recently operated
5. Disconnect negative battery terminal to prevent electrical issues during module replacement

Procedure

1. 1

   Disconnect battery negative terminal
   Using a 10mm socket, loosen the negative battery terminal bolt. Remove the negative cable from the battery post and secure it away from the battery to prevent accidental reconnection during the repair.
   Torque spec

   Battery Terminal Bolts6 Nm (4 lb-ft)
2. 2

   Remove passenger lower dash panel
   Locate the lower dash panel under the passenger side glove box area. Remove the plastic trim fasteners or screws securing the lower dash panel. Gently pull the panel down and away to access the blower motor area. You may need to disconnect any courtesy light connectors if equipped.
3. 3

   Locate blower motor control module
   Using a flashlight, locate the blower motor housing on the passenger side near the firewall. The blower motor control module is mounted on the side of the blower motor housing or on the HVAC case nearby. It will have a wire harness connector attached and typically has cooling fins or heat sink design.
   ℹ️The module may be covered in dust or debris from the HVAC system. Take note of the module orientation and connector position before removal.
4. 4

   Disconnect electrical connector
   Press the locking tab on the electrical connector attached to the blower motor control module and pull the connector straight off the module. Do not pull on the wires themselves. Inspect the connector terminals for corrosion or damage.
5. 5

   Remove control module mounting fasteners
   Using a 7mm socket, remove the mounting screws or bolts securing the blower motor control module to the housing. Most modules use 2-3 fasteners. Keep these fasteners as they will be reused unless corroded.
6. 6

   Remove old control module
   Carefully pull the blower motor control module away from the mounting surface. There may be thermal grease or a gasket between the module and housing for heat transfer. Note the position of any sealing elements.
7. 7

   Clean mounting surface
   Clean the mounting surface on the blower motor housing where the control module mounts. Remove any old thermal grease, gasket material, or debris. The surface should be clean and flat for proper heat dissipation from the new module.
8. 8

   Install new control module
   Position the new blower motor control module onto the mounting surface, ensuring any gasket or thermal pad is properly aligned. If the new module came with thermal grease, apply a thin layer to the mounting surface. Align the module with the mounting holes.
9. 9

   Install mounting fasteners
   Thread in the mounting screws or bolts by hand first to ensure proper thread engagement. Using a torque wrench and 7mm socket, tighten the module mounting bolts to specification. Tighten in a cross pattern if multiple fasteners are present to ensure even pressure.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
10. 10

    Reconnect electrical connector
    Apply a small amount of dielectric grease to the terminals inside the electrical connector to prevent corrosion. Push the connector firmly onto the blower motor control module until you hear or feel the locking tab click into place. Verify the connection is secure by gently tugging on the connector body.
11. 11

    Reinstall passenger lower dash panel
    Reconnect any courtesy light connectors if previously disconnected. Position the lower dash panel back into place and secure with the original fasteners or trim clips. Ensure the panel is fully seated and all attachment points are secured.
12. 12

    Reconnect battery negative terminal
    Clean the battery terminal and post if any corrosion is present. Place the negative cable back onto the negative battery post. Using a 10mm socket and torque wrench, tighten the battery terminal bolt to specification. Do not overtighten as this can damage the terminal.
    ⚠Ensure the terminal is making good contact with the battery post before tightening. Overtightening can crack the terminal or damage the battery post.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Verify all fasteners are tightened to specification
2. Ensure all electrical connections are secure and properly locked
3. Confirm lower dash panel is fully seated with no gaps or loose clips

Verification

• Turn ignition to ON position without starting engine
• Set climate control to various fan speed settings (low, medium, high) and verify all speeds operate correctly
• Listen for any unusual noises from the blower motor area
• Verify smooth transitions between fan speeds with no hesitation or cutting out
• Test both heating and cooling modes to ensure fan operates properly in all modes
• Check that there are no warning lights on the instrument cluster related to climate control

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