This procedure covers the removal and replacement of the blower motor resistor in a 2014 Ram 2500 with 6.7L Cummins diesel engine, located in the HVAC system under the passenger side dashboard.

Warnings

Tools required

Parts

• Blower motor resistor × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and turn off ignition, remove key
2. Allow HVAC system to cool if recently operated
3. Position work light to illuminate passenger footwell area
4. Adjust passenger seat fully rearward and recline if needed for access

Procedure

1. 1

   Locate the blower motor resistor
   The blower motor resistor is located on the passenger side of the vehicle, underneath the dashboard near the blower motor housing. It is positioned on the HVAC evaporator case, typically above the passenger footwell. Look for a rectangular electrical connector with a cooling fin assembly attached to the HVAC case.
2. 2

   Disconnect the electrical connector
   Locate the electrical connector attached to the blower motor resistor. Press the locking tab on the connector while pulling it straight away from the resistor. Do not pull on the wiring harness itself. If the connector is difficult to remove, gently rock it side to side while applying outward pressure.
3. 3

   Inspect the connector for damage
   Examine both the connector and resistor terminals for signs of melting, corrosion, or burnt contacts. These are common indicators of resistor failure. If the connector shows heat damage, it must be replaced along with the resistor to prevent repeat failure. Clean terminals with electrical contact cleaner if present and condition allows.
4. 4

   Remove the resistor mounting screws
   Using a 7mm socket or nut driver, remove the two screws securing the blower motor resistor to the HVAC case. These screws may be tight due to heat cycling. Keep track of the screws as they are small and easily lost in the footwell area.
   Torque spec

   Resistor Screws2 Nm (1.5 lb-ft)
5. 5

   Remove the old resistor
   Carefully pull the blower motor resistor straight out from the HVAC case. The resistor cooling fins slide into a mounting slot in the case. Do not twist or force the resistor, as this may damage the HVAC case sealing surface. Note the orientation of the resistor for proper installation of the replacement.
6. 6

   Clean the mounting surface
   Inspect the mounting opening in the HVAC case for debris, dust buildup, or damage. Remove any accumulated debris or leaves that may restrict airflow across the new resistor. Ensure the mounting surface is clean and free from old gasket material if equipped.
7. 7

   Install the new resistor
   Position the new blower motor resistor with the cooling fins aligned with the slot in the HVAC case. The electrical connector should face outward for easy access. Gently push the resistor into place until it seats fully against the HVAC case. Ensure proper alignment before installing screws.
8. 8

   Install and torque resistor screws
   Install both mounting screws by hand until finger-tight. Using an inch-pound torque wrench and 7mm socket, tighten the screws to specification in a cross pattern. Do not overtighten as this can strip the plastic HVAC case threads or crack the resistor mounting flange.
   Torque spec

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

   Reconnect the electrical connector
   Apply a thin coat of dielectric grease to the resistor terminals if available to improve connection and prevent corrosion. Align the electrical connector with the resistor terminals and push firmly until the locking tab clicks into place. Gently tug on the connector to verify it is fully seated and locked.

Reassembly

1. Return passenger seat to desired position
2. Remove work light and tools from passenger area

Verification

• Turn ignition to ON position without starting engine
• Set HVAC controls to various blower speeds (low, medium-low, medium-high, and high) to verify all speed settings work properly
• Listen for smooth blower motor operation without grinding or unusual noise
• Verify airflow increases appropriately with each blower speed setting
• Check that the blower motor does not run continuously when switched to OFF position
• Inspect connector area for any signs of arcing or overheating during initial operation

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