The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed. A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system.
Keeping this in view, what are the signs of a bad blower motor resistor?
The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn’t work at low speeds. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely.
Also, can you bypass the blower motor resistor? This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. 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.
Regarding this, how do you test a blower motor resistor?
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.
How much does it cost to replace a blower motor resistor?
The average cost for a blower motor resistor replacement is between $119 and $161. Labor costs are estimated between $47 and $60 while parts are priced between $72 and $101. Estimate does not include taxes and fees.
8 Related Question Answers Found
Where is the blower motor fuse?
Locate the fuse panel just beneath the dashboard on the driver side of the car. Remove the screw securing the fuse panel cover and remove the cover.
How do you know if a resistor is bad?
Set a digital multimeter for “ohms.” Set an ohms range that is equal to or higher than the value of the resistor to be tested. 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.
What can cause a blower motor to stop working?
In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. On all systems, a failed blower motor is least likely. Start by checking the blower fuse and HVAC controller fuse.
How long does it take to replace a blower motor resistor?
about 45 minutes
How do you test a blower motor?
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. If the circuits are in good repair but the blower motor keeps blowing fuses, replace the blower motor [source: You Fix Cars].
How do I know if my blower motor switch is bad?
Symptoms of a Bad or Failing Blower Motor Switch Switch only works on certain settings. One of the first symptoms commonly associated with a bad or failing blower motor switch is a switch that only works on certain settings. Switch is stuck. Another symptom of a bad or failing blower motor switch is a switch that is stuck, or frequently gets stuck. Broken knob.
Can you bypass a resistor?
A wire in the left circuit is shorting the 100Ω resistor. All current will bypass the resistor and travel through the short. The voltage across the 100Ω resistor is going to be zero. So typically the assumption of a short is done by redrawing the circuit.
How do I fix my fan speed control?
Turn off power to the fan at the circuit breaker. Remove the light bulbs and shades, if the fan is equipped with a light kit. Remove the small screws holding the switch housing cover or light kit base to the switch housing. Check all the wiring, using a noncontact voltage tester to ensure the power is off.