This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. Larry. Mine had gone open. Also, what causes heater resistors to burn out? Usually the resistor pack, but they blow for a reason. Overheating—if a motor finds it harder to move because of jamming or worn bearings, it can raise the resistor’s temperatures to dangerous levels. My blower would only work on "4". This can be annoying, but troubleshooting is easy. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely. It is responsible for controlling the blower motor’s fan speed. it has something to do with the blower motor resistor is next to the blower motor behind the glove compartment it prevents the wires from getting to hot check the wires or connection for signs of over heating clean the connector or just wiggle it if if no reaction change the resistor is a common part to go out but not expensive at all good luck A drop down menu will appear. Locate the blower motor resistor on the passenger side under the dash board. Bad dirty loose connections to either power and/or ground will increase the current over the ratings of the resistors. Remove the screws or bolts to the blower motor resistor and remove the resistor. There are several symptoms that appear when the resistor of the blower motor is going bad. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time. Asked By: Arne Grimmeissen | Last Updated: 19th April, 2020, Trent, one of the biggest reasons for blower motor, Set a digital multimeter for "ohms." Simple, neat. If the blower motor was turned on prior to servicing the blower motor resistor, wait five minutes to allow the blower motor resistors to cool before performing diagnosis or service. I know it is the correct resistor for the CJ3 climate control, and it did bring back 1-4 on the motor switch. The blower motor is located in the passenger side foot well. Another way may be to measure the current to the blower motor at full speed. What can cause a blower motor to stop working? The resistor of the blower motor is responsible for transferring the electrical current that's required to move air through the vents of vehicle. Also if the blower motor has bad bearings, too much load blows the resistor pack. To help keep it cool, the blower resistor block is located in the blower motor's air stream. If your vehicle is displaying any of the symptoms above, or you suspect that your blower motor resistor may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the component should be replaced. Move the lead from terminal 2 to terminal 3 and check this reading against specifications. How do you change a blower motor resistor? Why does my heater only work on high? What is the most powerful handheld blower? Blowerresistors are small parts that can become corroded or just burn out, and a new one often costs less than $50. Order Blower Motor Resistor for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. Thanks for subscribing. As the fan speed is one of the most frequently adjusted settings of the air conditioning system, the blower motor resistor is put under constant stress, which can cause it to eventually fail. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. Click on the icon for your Adblocker in your browser. And thanks for reading Autoblog. determine if the component should be replaced, Symptoms of a Bad or Failing Heater Blower Motor Resistor. You still haven't turned off your adblocker or allowed our site. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. 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. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. On the low setting the resistors are larger taking more load - less to motor - slower speed. I saw many Durangos with the connector and resistor already cut out. 1. The thermistor is located on the resistor assembly. A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system. Most times this will present itself as melted areas on the wire harness. If the blower motor was turned on prior to servicing the blower motor resistor, wait five minutes to allow the resistor to cool before performing diagnosis or service. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. Still, it's gonna' eventually fail. Please follow the instructions below to enable JavaScript in your browser. If you'd be so kind as to allow our site, we promise to keep bringing you great content. This page is for personal, non-commercial use. The blower motor resistor often gets very hot, and can wear out or burn over time. Thanks for that. Over time, that heat can cause the resistor to fail naturally. It's mounted outside on the firewall in the heater and air conditioning core cover. Fan only blows at certain speeds. I have a 2014 Limited. But ads are also how we keep the garage doors open and the lights on here at Autoblog - and keep our stories free for you and for everyone. It only takes a few seconds. Place the other lead on terminal 2 and check against specifications. The blower motor doesnt have speeds set into it, it runs faster when more current is applied or slower at lower current. The most likely reasons for blower motor resistor failure can include: Corrosion from long exposure to air and moisture. It is responsible for controlling the blower motor’s fan speed. In reducing the blower motor fan speed, the blower resistor gets very hot. Get rid of it! This may have happened because it's very hot here in Ottawa, or because months ago I replaced a broken blower … It's problem after problem. You will need to remove the kick panel on the passenger side to get at the motor. Set an ohms range that is equal to or higher than the value of the, A wire in the left circuit is shorting the 100Ω, If little air is coming through the vents (hot or cold), then it could be because the, It's located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. The blower motor resistor is in charge of regulating the speed of the blower motor. A. If little air is coming through the vents (hot or cold), then it could be because the blower motorfor the fanor a switch or resistor that controls fanspeed isn't working. Normal wear due to … The origional resistors are made from nichrome wire and are placed in the air stream for cooling, as they get very hot. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. How much does it cost to play a round of golf at Augusta National? It can be difficult to get at. Eventually, it's this heat that's gonna' fry it. Usually a bad or failing blower motor resistor will produce a few symptoms that can alert the driver of a potential issue. What instruments do they use in flamenco? Ads can be annoying. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored. Signs that the blower motor resistor in your Acura TL needs to be replaced may include the blower motor not working or being stuck on just one speed, or the blower motor may work only on certain speeds. Copyright 2020 FindAnyAnswer All rights reserved. Put the only one back in which seems to be working on with the controller set to high, however, the blower motor runs very very slow. Can you eat potatoes that are black inside? 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. You may have a bad blower motor resistor. However, as a side effect of reducing current flow, resistors generate heat. I found the resistor, it has a safety cut-out where excess heat melts solder and a spring breaks the contact. If you back the speed down anymore, it gets even hotter and then starts pulsating the blower, Trent, one of the biggest reasons for blower motor resistors to have shorten life is actually because of faulty blower motor drawing too many amps, some times melting wires/plugs, heating up resistors shortening their life. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents. With that value, you can compute the required resistance needed for each speed. Just so, can you test a blower motor resistor? The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. i have replaced the resistor 3 … This can also be caused by a blower motor switch, so a proper diagnosis is highly recommended if you are uncertain of what the issue may be. What is the difference between fan blower and compressor? The resistor generally fails because of foreign objects jamming the blower motor fan blade, which causes the resistor to overheat. Can you lay a washing machine down to transport? Root cause insight into the common BMW blower motor resistor failures: ... the heat sink starts to get very hot, but the blower still runs at 80%. Another symptom of a faulty blower motor resistor is no air from the vehicle’s vents at all. 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