Share Share. Burned-out blower motor resistor pulled off a Ford E van. Remove and clean blower motor fan Replace air cabin filter Remove and clean your blower motor fan to prevent future HVAC issues. How to Replace a Blower Motor Resistor The blower motor resistor is usually extremely easy to access, but the hard part can be positioning your body inside the car to remove the part.
Step 1 : Remove the glove box door, if necessary. Step 2 : Disconnect the wiring harness and remove screws. Step 3 : Remove and replace the blower motor resistor.
Step 4 : Tighten screws and reattach wiring harness. Step 5 : Reinstall the glove box door. Where is a blower motor resistor located? Where is resistor located? What causes blower motor resistor failure? Can I bypass blower resistor? Why is my blower motor not working? Why is my car not blowing any air? How long does it take to replace blower motor in car? When the resistor goes out, you might not be able to get any air to come out of the vents. When it fails, it can cut off all power to the motor.
You are left with a heater or air conditioner with nothing coming out of the vents. However, there are other things you might want to check before the resistor if nothing is coming out of the vents. If nothing is working, you should start by looking at the fuses first. From here, you might also consider that the blower motor itself has quit.
The blower motor resistor is part of the HVAC system and is an electrical component. It controls the blower motor fan speed. When you adjust the fan speed on the instrument cluster in your vehicle, the resistor is responsible for adjusting the speed that the blower motor runs at.
Because the fan speed is regularly adjusted, the resistor endures a lot of wear. The constant stress can cause it to fail at any time. The heater blower motor resistor is often found beneath the dashboard. It is located in the heater and air conditioning compartment. It can also be found behind the glove box of some vehicles. In the highest speed state, the blower resistor is bypassed completely and the fan is connected directly to the car's battery, which allows maximum current through the motor.
Locate the blower motor. On most vehicles, it will be located inside the engine bay along the firewall on the passenger side of the vehicle. On some vehicles, it may be located inside the passenger compartment, below the dash on the passenger side of the vehicle. Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced.
Move the lead from terminal 2 to terminal 3 and check this reading against specifications. Estimate does not include taxes and fees. Set a digital multimeter for "ohms. Touch the red lead from the meter to one side, and the black lead to the other. Resistors do not hold a polarity, so it doesn't matter which side gets the red or black lead.
One of the first symptoms of a potential problem with the vehicle's heater blower motor is low airflow from the vents. Fan only blows at certain speeds. Another symptom of a bad or failing heater blower motor is a motor that only functions at certain speeds. No air from the vents. How to Test a Blower Motor Use voltmeter or ohmmeter to check for a blown fuse. If you find one, replace it. Start car and see if blower motor works.
If fuse blows again, check for loose circuits.
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