Replace the HVAC blower motor control module (blower speed controller) on a 2024 Model 3 Long Range. The module is accessed from the passenger-side footwell, mounted to the HVAC housing adjacent to the blower motor.

Warnings

Tools required

Parts

• HVAC Blower Motor Control Module (speed controller/resistor module) × 1 — Manufacturer-specified blower control module for 2024 Model 3 — refer to Tesla parts catalog by VIN

Preparation

1. Park on level ground, place in P, engage the parking brake.
2. Exit all doors with the key fob/phone key carried at least 3 meters away from the vehicle. Wait a minimum of 2 minutes for HV systems to fully de-energize, even though this is a non-HV job.
3. Disconnect the low-voltage (12V/16V Li-ion on 2024) battery. On 2024 Model 3, refer to architecture notes for exact location — typically accessed under a service panel; isolate the negative terminal first and insulate it.
4. Do NOT touch, cut, or pierce ANY orange cable — these are high-voltage and lethal.
5. If you encounter an orange cable, an HV component, or are unsure if a system is de-energized: STOP and consult a Tesla-certified technician.
6. Set HVAC to OFF before disconnecting 12V (helps prevent stored fault codes).
7. Move the front passenger seat fully rearward and recline for footwell access.
8. Remove any floor mat from the passenger footwell.

Procedure

1. 1

   Remove passenger-side lower dash trim
   Using a plastic trim tool, gently release the lower trim panel covering the passenger footwell/glovebox underside. Work clips loose progressively around the edge — do not yank. Disconnect any footwell light or ambient lighting connector if present, then set the panel aside.
   ⚠Trim clips on Model 3 are brittle in cold conditions. Warm the cabin if working below ~10°C/50°F.
2. 2

   Remove insulation/sound deadening pad
   Remove the foam/felt acoustic pad covering the HVAC housing in the footwell. It is typically retained by plastic push-pin fasteners and/or hook-and-loop. Set aside for reinstallation.
3. 3

   Locate the blower motor control module
   Identify the blower control module on the side of the HVAC housing, adjacent to the blower motor (the circular fan housing). The module will have a wiring connector and is typically secured by 2 small screws into the HVAC case. It often has a small finned heat sink protruding into the airflow.
4. 4

   Disconnect the module wiring connector
   Press the connector lock tab and gently pull the harness connector straight off the module. Do not pull on the wires. Inspect connector pins for corrosion, melting, or push-out — report any damage as it indicates upstream issues that will destroy the new module.
   ⚠Melted or discolored connector terminals indicate a high-current fault — replacing only the module without addressing the connector will cause repeat failure.
5. 5

   Remove the module retaining screws
   Remove the screws (typically Torx or Phillips) securing the module to the HVAC housing. Support the module as the last screw is removed so it does not fall into the footwell.
6. 6

   Withdraw the old module
   Carefully pull the module straight out of the HVAC housing. The heat sink portion sits inside the air duct — withdraw it without forcing or twisting to avoid damaging the housing seal or the heat sink fins.
7. 7

   Inspect the HVAC housing and blower
   Inspect the module mounting opening for debris, leaves, or rodent intrusion. With a flashlight, check the visible portion of the blower wheel for damage or obstruction — a seized/dragging blower is a common cause of control module failure and must be addressed before installing the new module.
   ℹ️If the cabin air filter has not been replaced in 2 years, replace it now — Tesla recommends cabin filter replacement every 2 years.
8. 8

   Install the new blower control module
   Align the new module's heat sink with the housing opening and seat it fully against the mounting surface. Ensure any gasket or seal is properly positioned to prevent air bypass.
9. 9

   Secure the module
   Install the retaining screws and tighten evenly. Torque to OEM specification — refer to Tesla Service Manual. Do not overtighten; the HVAC housing is plastic and threads strip easily.
10. 10

    Reconnect the wiring harness
    Press the harness connector firmly onto the module until the lock tab clicks fully. Verify it is seated by lightly tugging on the connector body (not the wires).
    Torque spec

    Connector Screws4 Nm (3 lb-ft)

Reassembly

1. Reinstall the acoustic insulation pad in its original position.
2. Reinstall the lower dash/footwell trim panel, reconnecting any lighting connectors first. Press all clips home until fully seated.
3. Reposition the floor mat and return the passenger seat to its previous position.
4. Reconnect the low-voltage battery negative terminal. Torque to Battery Terminal Bolts spec (6.0 Nm / 4.0 lb-ft).
5. Close all doors and allow the vehicle to wake and complete its self-check before testing.

Verification

• Power the vehicle on (brake pedal pressed) and turn HVAC on.
• Cycle the fan through ALL speed settings from 1 to maximum. Confirm smooth, progressive speed change at each step — a failing or mismatched module often produces only on/off behavior or skipped speeds.
• Listen for unusual whine, buzz, or chatter from the passenger footwell area — could indicate PWM module fault or loose mounting.
• Verify no HVAC-related alerts appear on the center touchscreen after a 5-minute drive cycle.
• Check that auto climate ramps fan speed smoothly when temperature delta is large.
• Confirm no airflow leak/whistle from the module mounting area at high fan speed.
• Note: While the dash is open, this is also a convenient time to replace the cabin air filter if due (Tesla recommends every 2 years).

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