Blend Door Actuator

Replace the HVAC blend door actuator to restore temperature control functionality in the 2008 Dodge Viper's climate control system.

Warnings

Tools required

Parts

• HVAC blend door actuator × 1 — Use OEM specification or Mopar 68032493AA

Preparation

1. Park vehicle on level surface and turn off ignition
2. Allow vehicle to cool completely if recently driven
3. Disconnect negative battery terminal and wait 2 minutes for airbag system to discharge
4. Position driver's seat fully rearward for working room on passenger side

Procedure

1. 1

   Remove passenger side lower dashboard panel
   Locate the lower dashboard panel on the passenger side footwell area. Remove fasteners securing the panel (typically 3-4 fasteners along the top edge and sides). Gently pull the panel away from the dashboard structure, releasing any remaining clips. Disconnect any electrical connectors for courtesy lights if equipped, then remove the panel from the vehicle.
2. 2

   Access the glove box area
   Open the glove box and remove the contents. Locate the glove box stops on both sides that limit its opening range. Squeeze the sides of the glove box inward while lowering it past the stops to allow it to drop down fully. Dropping the glove box may provide access to portions of the HVAC housing; verify actual actuator access point against 2008 Viper service documentation as it may require additional dash disassembly.
3. 3

   Remove glove box assembly
   With the glove box fully dropped, locate the mounting fasteners securing it to the dashboard structure (typically 4 fasteners). Remove these fasteners using an appropriate socket. Support the glove box while removing the final fastener, then carefully remove the assembly from the vehicle. Note the position of any wiring harnesses that may need to be maneuvered around.
4. 4

   Locate the blend door actuator
   Using a flashlight, identify the blend door actuator on the HVAC housing. The actuator is a small electric motor assembly mounted on the HVAC housing; verify exact mounting location against 2008 Viper service documentation, as it may be on the passenger side, driver's side, or underside of the housing. It will have an electrical connector and 2-3 mounting fasteners. The actuator output shaft engages directly with the blend door linkage.
5. 5

   Disconnect actuator electrical connector
   Locate the electrical connector on the blend door actuator. Press the locking tab on the connector and carefully pull it away from the actuator. If access is restricted, use a small pick to release the locking tab while applying gentle outward pressure on the connector body.
6. 6

   Remove actuator mounting fasteners
   Remove the mounting fasteners securing the blend door actuator to the HVAC housing (typically 2-3 screws; verify head type/size against 2008 Viper documentation, commonly Phillips or Torx self-tapping screws). Support the actuator while removing the final fastener to prevent it from falling into the dashboard cavity.
7. 7

   Remove old actuator
   Gently rotate the actuator slightly while pulling it away from the HVAC housing to disengage the output shaft from the blend door linkage. Note the orientation of the actuator and the position of the output shaft for proper installation of the new unit. Remove the actuator from the vehicle.
8. 8

   Prepare new actuator for installation
   Inspect the new blend door actuator to ensure it matches the original unit. Check that the output shaft moves freely through its range. Note the position of the output shaft on the new actuator - it should be in a mid-range position for easiest installation. Do not force the shaft position as it is controlled internally.
9. 9

   Install new actuator
   Align the output shaft of the new actuator with the blend door linkage on the HVAC housing. Gently rotate the actuator body as needed to engage the shaft with the linkage, then push the actuator into position against the mounting surface. Ensure the actuator is fully seated before installing fasteners.
10. 10

    Secure actuator and reconnect electrical
    Install the mounting fasteners and tighten them securely, ensuring the actuator does not shift during tightening. Connect the electrical connector to the actuator, pressing firmly until the locking tab clicks into place. Verify the connection is secure by gently tugging on the connector.
11. 11

    Test actuator operation
    Reconnect the negative battery terminal. Turn the ignition to the ON position without starting the engine and allow the HVAC system to perform its actuator calibration cycle (the actuator may self-calibrate on power-up). Operate the temperature control through its full range (full cold to full hot) and listen for the actuator motor operating smoothly. If temperature control is erratic, a scan tool calibration may be required. Observe the actuator to ensure it moves through its range without binding or unusual noise. Turn off the ignition.
12. 12

    Reinstall glove box assembly
    Position the glove box assembly back into the dashboard opening, routing any wiring harnesses as noted during removal. Install and tighten the mounting fasteners. Close the glove box and verify it operates correctly with the side stops engaging properly.
13. 13

    Reinstall lower dashboard panel
    Reconnect any electrical connectors for courtesy lights if applicable. Position the lower dashboard panel into place, aligning the clips with their receptacles. Press firmly around the perimeter to engage the clips, then install the fasteners and tighten securely.

Reassembly

1. Ensure all electrical connections are secure and properly locked
2. Verify all dashboard panels are properly seated and all fasteners are installed
3. Return driver's seat to normal position

Verification

• Start the engine and allow the HVAC system to initialize (approximately 30 seconds)
• Set the temperature control to full cold and verify cold air is delivered within 1-2 minutes of operation
• Set the temperature control to full hot and verify hot air is delivered (engine must be at operating temperature)
• Move the temperature control slowly from cold to hot and verify smooth temperature transitions without sudden jumps or delays
• Listen for any unusual clicking or grinding noises from the actuator during operation
• Verify all dashboard panels are secure and there are no rattles or loose components

Related trouble codes on this vehicle

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