Blower Motor

This procedure covers the removal and replacement of the blower motor assembly located in the HVAC housing under the passenger side dashboard of the 2007 Ram 3500.

Warnings

Tools required

Parts

• Blower motor assembly × 1 — Use OEM specification or quality aftermarket
• Blower motor resistor (if damaged) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and set parking brake
2. Turn ignition to OFF position
3. Disconnect negative battery cable to prevent electrical short circuits
4. Allow HVAC system to cool if recently operated
5. Open passenger door fully for access

Procedure

1. 1

   Access passenger side lower dash area
   Position yourself in the passenger side footwell. You may need to move the passenger seat fully rearward for better access. The blower motor is located high up in the footwell area behind the lower dash panel.
2. 2

   Remove lower dash insulator panel (if equipped)
   Some models have a lower dash insulator panel that needs removal for better access. Remove any push-pin fasteners or screws securing the panel and carefully lower it down. Set aside in a safe location.
3. 3

   Locate blower motor assembly
   Using your work light, locate the blower motor housing on the passenger side of the HVAC unit. It is mounted to the passenger side of the HVAC housing, accessible from below, with the electrical connector accessible from the lower/rear side of the motor.
4. 4

   Disconnect blower motor electrical connector
   Locate the electrical connector on the blower motor. Press the locking tab and pull the connector straight off the motor. You may need to use a flathead screwdriver to gently release the tab if it is difficult to access. Note the connector orientation for reinstallation.
5. 5

   Remove blower motor cooling tube
   If equipped, the blower motor may have a small cooling/vent tube. If present, gently pull it off the blower motor housing; it may be stiff from age but should pull free with steady pressure. Not all vehicles have this tube.
6. 6

   Remove blower motor mounting screws
   Using a 7mm socket with extension, remove the three screws securing the blower motor to the HVAC housing. These screws are accessed from below and may be in tight quarters. Support the motor with one hand while removing the final screw to prevent it from falling.
   Torque spec

   Blower Motor Screws4 Nm (3 lb-ft)
7. 7

   Remove blower motor assembly
   Carefully lower the blower motor assembly down and out of the HVAC housing. You may need to rotate it slightly to clear the housing opening. The motor with fan wheel attached will come out as a complete assembly. Inspect the fan wheel for damage or debris.
8. 8

   Inspect blower motor resistor
   While you have access, inspect the blower motor resistor located near the blower motor housing. Check for signs of burning, corrosion, or damage. If the resistor is damaged, remove the two screws securing it and replace it now.
   Torque spec

   Blower Motor Resistor Screws2 Nm (1.5 lb-ft)
9. 9

   Clean HVAC housing opening
   Before installing the new blower motor, clean any debris, leaves, or dirt from the HVAC housing opening and surrounding area. Check that the mounting surface is clean and free of obstructions.
10. 10

    Install new blower motor assembly
    Guide the new blower motor assembly up into the HVAC housing opening. Align the mounting holes and ensure the cooling tube port is properly positioned. The motor should seat flush against the housing.
11. 11

    Install blower motor mounting screws
    Install the three mounting screws and tighten to 4.0 Nm (3.0 lb-ft) using a 7mm socket. Tighten in a cross pattern to ensure even seating. Do not overtighten as the housing is plastic.
    Torque spec

    Blower Motor Screws4 Nm (3 lb-ft)
12. 12

    Reconnect cooling tube and electrical connector
    Push the rubber cooling tube firmly onto the blower motor housing until it seats completely. Reconnect the electrical connector to the blower motor, ensuring it clicks into place and the locking tab engages.
13. 13

    Reinstall lower dash panel
    If removed, reinstall the lower dash insulator panel by aligning it to the mounting points and securing with push-pins or screws. Ensure all fasteners are properly seated.
14. 14

    Reconnect battery and test operation
    Reconnect the negative battery cable. Turn the ignition to ON position without starting the engine. Test the blower motor at all speed settings (LOW, MED-LOW, MED-HIGH, HIGH) to verify proper operation. Listen for unusual noises or vibrations.

Reassembly

1. Ensure all electrical connections are secure and locked in place
2. Verify cooling tube is fully seated on blower motor housing
3. Check that all mounting screws are tightened to specification
4. Confirm lower dash panels are properly reinstalled

Verification

• Start the engine and test blower motor at all four speed settings
• Verify smooth, quiet operation with no unusual noises or vibrations
• Check that air flows properly from all vent positions
• Confirm no air leaks around the blower motor housing
• Test both heat and A/C modes to ensure proper blower function
• Reset clock and radio presets as needed

Related trouble codes on this vehicle

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

Chasing one of these codes and not sure which part is guilty? Ask a master mechanic about YOUR car →

More procedures for this vehicle