electrical

Blower Motor Resistor

for 2023 Chevrolet Bolt EUV 65 kWh Single Motor FWD · FWD

Editorial review:Chris Hackleman — Master Technician · 20+ years

Difficulty

Easy

Time

48 min

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman — 20+ years each). Always follow the vehicle's factory service information and torque specs.

This procedure replaces the blower motor resistor, which controls the HVAC blower motor speed, located in the HVAC module under the passenger side dash.

Warnings

⚠️This is an electric vehicle. Ensure the vehicle is powered off and the key fob is outside the vehicle before beginning work.

⚠Disconnect the 12V battery negative terminal and wait 2 minutes before working on electrical components to allow capacitors to discharge.

ℹ️The blower motor resistor connector may be tight and requires firm pressure to disconnect. Do not pull on wires.

Tools required

7mm socket or nut driverEssential

Torx T20 screwdriverEssential

Trim panel removal tool set

Torque wrench (1-10 Nm range)Essential

Shop light or flashlightEssential

Electrical contact cleaner

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Parts

Blower motor resistor × 1 — Use OEM specification
Push-pin retainers (if damaged) × 5 — Use OEM specification

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Preparation

Park vehicle on level surface and engage parking brake
Power off the vehicle completely and remove key fob from vehicle interior
Allow HVAC system to cool if recently operated
Open passenger door for access to lower dash area

Procedure

1
Disconnect 12V battery
Open the hood and locate the 12V battery in the engine compartment. Using a 10mm socket, loosen and remove the negative battery terminal. Secure the cable away from the battery post. Wait 2 minutes for electrical system discharge.
Torque spec
Battery Terminal Bolts7 Nm (5 lb-ft)
2
Remove passenger lower dash trim panel
From the passenger footwell, locate the lower dash insulator panel. Remove the push-pin retainers by pulling the center portion out first, then removing the entire retainer. Carefully pull the panel away from the dash and set aside. Take care not to break the retaining clips.
3
Locate blower motor resistor
Using a shop light, locate the blower motor resistor on the passenger side of the HVAC module. It is mounted to the HVAC case near the blower motor and has a wiring harness connector with multiple pins. The resistor will have cooling fins visible.
4
Disconnect resistor electrical connector
Press the locking tab on the resistor electrical connector and pull straight away from the resistor. The connector may be tight due to thermal cycling. Use firm, steady pressure and avoid pulling on the wires. If needed, gently rock the connector side to side while pulling.
5
Remove resistor mounting screws
Using a Torx T20 screwdriver, remove the two screws securing the blower motor resistor to the HVAC module case. Support the resistor while removing the second screw to prevent it from falling.
Torque spec
Resistor Screws2 Nm (1.5 lb-ft)
6
Remove old resistor
Carefully pull the blower motor resistor straight out from the HVAC module. The resistor has a rubber seal that may create resistance. Inspect the mounting area and seal groove for debris, moisture, or damage.
7
Prepare new resistor
Verify the new resistor matches the old unit. Inspect the rubber seal on the new resistor to ensure it is properly seated in the groove. If reusing the old seal, clean it with electrical contact cleaner and ensure it is free of cracks.
8
Install new resistor
Align the new blower motor resistor with the mounting holes on the HVAC module. Ensure the seal makes proper contact with the HVAC case. Push the resistor firmly into position until it seats completely against the case.
9
Install resistor mounting screws
Install the two Torx T20 mounting screws by hand to ensure proper thread engagement. Using a torque wrench, tighten the screws to specification in a cross pattern to ensure even seal compression.
Torque spec
Resistor Screws2 Nm (1.5 lb-ft)
10
Reconnect electrical connector
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.
11
Reinstall lower dash panel
Position the passenger lower dash insulator panel and align the retaining clip locations. Install the push-pin retainers by inserting the outer portion first, then pressing the center pins until flush. Ensure all clips are fully engaged.
12
Reconnect 12V battery
Reconnect the negative battery terminal to the battery post. Using a 10mm socket and torque wrench, tighten the terminal bolt to specification. Ensure the connection is clean and secure.
Torque spec
Battery Terminal Bolts7 Nm (5 lb-ft)

Reassembly

Ensure all trim panels are properly secured with all retaining clips engaged
Verify no tools or parts were left in the dash area
Close the hood and all doors

Verification

Power on the vehicle and turn the HVAC system blower to the lowest speed setting. The blower should operate quietly and smoothly
Cycle through all blower speed settings (typically 1-4 or variable) to verify the resistor controls all speeds correctly
Listen for unusual noises or vibrations that might indicate improper installation
Verify airflow increases proportionally with each speed setting
Check that no error messages or warning lights appear on the instrument cluster related to the HVAC system
Test both heating and cooling modes at various fan speeds to ensure full functionality