Blower Motor

This procedure covers the removal and replacement of the blower motor assembly located in the HVAC housing under the passenger side dashboard on 1994-2007 Dodge Ram 2500 trucks with the 5.9L Cummins diesel engine.

Warnings

Tools required

Parts

• HVAC blower motor assembly × 1 — Use OEM specification or equivalent (verify wheel attachment type)
• Blower motor resistor (if failed) × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and engage parking brake
2. Allow HVAC system to cool completely if recently operated
3. Disconnect negative battery terminal and wait 2 minutes for system discharge
4. Open passenger door fully for access
5. Optional but recommended: Remove passenger seat by removing four 13mm seat mounting bolts for easier access to lower dash area

Procedure

1. 1

   Access lower dash panel
   Determine access location for your model year: on many 1994-2002 Dodge Ram trucks the blower motor is accessed from the engine compartment side of the passenger firewall, while later configurations may allow footwell access. Verify against the factory service manual, then position yourself accordingly. This panel may be held by plastic push clips or screws depending on trim level.
2. 2

   Remove lower dash panel
   Carefully remove any plastic push clips or screws securing the lower dash insulation panel. Gently pull the panel down and away to expose the blower motor housing. Set panel aside in a safe location.
3. 3

   Locate blower motor assembly
   Use a flashlight to identify the blower motor assembly. It is a cylindrical housing mounted to the HVAC evaporator/blower case on the passenger side. On these trucks the blower motor is commonly accessible from the engine-side of the firewall rather than the footwell. The motor will have an electrical connector attached and is secured by mounting screws around its flange — verify exact screw count against the factory service manual for your model year.
4. 4

   Disconnect blower motor electrical connector
   Locate the electrical connector attached to the blower motor. Press the locking tab and carefully pull the connector straight off the motor terminals. Note the connector orientation for reinstallation.
5. 5

   Remove blower motor mounting screws
   Using the appropriate socket or nut driver (commonly 5.5mm–8mm for these Chrysler HVAC screws), remove the screws securing the blower motor to the HVAC housing. Verify the exact screw count and size against the factory service manual for your model year before removal. Support the motor with one hand while removing the final screw to prevent it from falling.
6. 6

   Extract blower motor assembly
   Carefully rotate and maneuver the blower motor assembly out of the HVAC housing. The motor and fan wheel assembly may require angling to clear the surrounding structure. Avoid hitting the fan wheel against the housing as it can be damaged easily.
7. 7

   Inspect blower motor resistor
   With the blower motor removed, inspect the blower motor resistor module located near the blower motor opening. Check for signs of burning, corrosion, or damage. If resistor is faulty, remove the two screws securing it and disconnect its electrical connector for replacement.
   Torque spec

   Blower Motor Resistor Screws2 Nm (1.5 lb-ft)
8. 8

   Clean blower housing area
   Use a clean rag or shop vacuum to remove any leaves, debris, or dust from the blower motor housing opening and surrounding evaporator case area. Inspect the housing seal surface for damage or deterioration.
9. 9

   Install new blower motor
   Position the new blower motor assembly with the fan wheel oriented correctly (intake side toward housing). Carefully insert the assembly into the HVAC housing, ensuring the mounting flange aligns with the screw holes. Verify any rubber seal or gasket is properly seated.
10. 10

    Secure blower motor
    Install the three blower motor mounting screws and tighten in a star pattern to ensure even seating. Tighten the blower motor mounting screws snug into the plastic housing — do not over-tighten to avoid stripping. If a torque spec is required, verify the value against the factory service manual (typically in the 15–20 lb-in range for plastic HVAC housings).
11. 11

    Reconnect electrical connector
    Plug the electrical connector onto the blower motor terminals, ensuring it clicks into place and the locking tab engages fully. Verify the connection is secure by gently tugging on the connector.
12. 12

    Reinstall lower dash panel
    Position the lower dash insulation panel back into place and secure with the original push clips or screws. Ensure all clips are fully seated and the panel fits flush.

Reassembly

1. If passenger seat was removed, reinstall and torque mounting bolts to factory specification (typically 35-45 lb-ft)
2. Reconnect negative battery terminal and tighten securely
3. Verify all tools and parts have been removed from passenger footwell area

Verification

• Turn ignition to ON position without starting engine
• Set HVAC controls to different fan speeds (low, medium, high) and verify blower motor operates smoothly at all speeds without unusual noise
• Check for proper airflow from all vents in various mode settings (defrost, floor, panel)
• Listen for any rattling, squealing, or grinding noises that would indicate improper installation or debris in fan wheel
• Verify no air leaks around blower motor housing by feeling for escaping air at panel seams with blower on high
• Test blower motor with engine running to confirm proper operation under normal electrical load conditions

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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