When do you need to replace a blower motor resistor?
If your interior AC/ Heat fan is not working on low, or one of the fan settings isnt working, then you probably need to replace the blower motor resistor. This video will go though all of the steps and give you some helpful tips and tricks!
What kind of resistor does a blower fan use?
The newer style of blower resistor uses electronics to send small pulses to the blower motor and based on how frequent the pulses are can speed up and slow down the blower fan. Blower motors can be fairly cheap if they are a manual resistor block style.
What are the symptoms of a bad heater motor resistor?
Symptoms of a Bad or Failing Heater Blower Motor Resistor. 1 1. Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower 2 2. Blower motor does not work on certain settings. 3 3. No air from the vehicle’s vents.
How is the speed of the blower motor controlled?
The electronic module that controls the speed of the blower motor is called a blower motor control module. In some cars, the blower motor has only 4 or 5 fixed speeds. In this case, the speed of the blower motor is controlled by a blower motor resistor.
How much does it cost to replace a blower motor resistor?
The blower motor resistor or control module replacement is not very expensive. For example, one of our colleagues had a problem with his 2011 Ford Escape: the fan only worked at the speed 4. He paid $50 to diagnose and $112 to replace the resistor at a local Ford dealership.
How to replace an AC blower control relay?
Simply remove the screws, unplug the electrical connector on the resistor and the pigtail that secure the blower motor resistor from the blower, remove the resistor or heater control relay assembly, and install the new resistor in place. OEM Fit, Quality, Finish – All mounting ports and sockets on the resistor are identical to your factory part.
What does the blower motor resistor do in a car?
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. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.
Symptoms of a Bad or Failing Heater Blower Motor Resistor. 1 1. Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower 2 2. Blower motor does not work on certain settings. 3 3. No air from the vehicle’s vents.
Can a broken motor switch stop a blower?
A broken blower motor switch can also stop the blower from changing to certain speed settings. If your blower motor cannot change to certain speeds, check both the resistor and the switch on your dashboard. The most common failure points are the resistor and the motor itself.
How does a blower motor resistor control the fan speed?
The blower motor resistor controls the fan speed of the blower motor and the resulting change in air pressure produced by the movement of the blower fan. It accomplishes this by regulating the electric current that powers the motor.
How does a relay work on a blower motor?
Finally, with the fan switch on the highest speed, the fan motor is receiving system voltage (14.5 with the engine running). Some systems will energize a relay when the switch is set at the highest fan speed. The relay then closes its contacts, feeding full voltage to the fan, because a relay can handle the current better than the fan switch.
Where is the blower motor resistor located on a car?
Blower Motor Resistor. Blower Motor Resistor. What is a blower motor resistor and where is it located? The blower motor resistor, also commonly referred to as an A/C blower motor resistor or a heater blower motor resistor, is an important component to your vehicle’s heating, ventilation, air conditioning (HVAC) system.
A broken blower motor switch can also stop the blower from changing to certain speed settings. If your blower motor cannot change to certain speeds, check both the resistor and the switch on your dashboard. The most common failure points are the resistor and the motor itself.
Why are there so many resistors on a blower switch?
The blower switch and its gang of resistors are wired so that when the blower switch is set at the lowest speed, the maximum amount of voltage is dropped and the least amount of current is fed to the motor because it is passing through an entire series of resistors – for our purposes we’ll say there are three resistors.
Can a Nissan blower fan be replaced without removing the dashboard?
The blower motor fan may need replacement. I will show you how you can replace your Nissan Blower Motor without removing the dashboard. Disclaimers: all opinions are my own, sponsors are acknowledged. Links in the description are typically affiliate links that let you help support the channel at no extra cost. Loading…
Where is the relay for the blower motor?
The blower motor relay could be possibly bad. Relay is located at the fuse block on driver-side, remove plastic door on top of hood release latch. Switch relay with another relay and see if it works. Since my car manual did not show a way to test the resistor, I decided to replace the resistor and that fixed the problem.
Where is the relay on a Nissan fan?
Relay is located at the fuse block on driver-side, remove plastic door on top of hood release latch. Switch relay with another relay and see if it works. Since my car manual did not show a way to test the resistor, I decided to replace the resistor and that fixed the problem.
What are the symptoms of a bad blower motor resistor?
Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings.
The blower motor relay could be possibly bad. Relay is located at the fuse block on driver-side, remove plastic door on top of hood release latch. Switch relay with another relay and see if it works. Since my car manual did not show a way to test the resistor, I decided to replace the resistor and that fixed the problem.
The blower motor resistor controls the fan speed of the blower motor and the resulting change in air pressure produced by the movement of the blower fan. It accomplishes this by regulating the electric current that powers the motor.
Where does the power transistor go in a blower motor?
The power transistor has 4 wires: two come from the climate control system control unit, one is the ground, one goes to the negative terminal of the blower motor. The service manual advises measuring the voltage at the blower motor, then if not OK, at the power transistor and so on.
How to replace blower motor resistor 08-12 Ford Escape?
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What is the function of blower motor?
What Does a Blower Motor Resistor Do? Definition. A blower motor resistor, typically located beneath the passenger side dashboard, contains three resistors, or sets of terminals designed to generate voltage in proportion to electrical current. Function. Blower motor resistors contain controls that determine air settings. Repair.
Is there a fuse for the blower motor?
The blower motor is powered by a fuse-like device called a relay. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. While replacement is easy, the exact location of your blower motor fuse may vary from vehicle to vehicle. Step 1
What does blower motor resistor do?
What is an AC resistor?
Resistor AC Response. For ordinary currents and frequencies the behavior of a resistor is that of a dissipative element which converts electrical energy into heat. It is independent of the direction of current flow and independent of the frequency. So we say that the AC impedance of a resistor is the same as its DC resistance.