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. 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. Usually the resistor pack, but they blow for a reason. Check here for special coupons and promotions. The user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor pack. With that value, you can compute the required resistance needed for each speed. Fan only blows at certain speeds. Heater blower motor resistors are generally installed as a part of the heating, ventilation, and air-conditioning system to keep the air that flows through the HVAC system cooling down the resistor. 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. What instruments do they use in flamenco? I have a 2002 Durango SLT and my blower motor resistor wiring harness connector just burned up. You must have JavaScript enabled to experience the new Autoblog. Another symptom of a bad or failing heater blower motor is a motor that only functions at certain speeds. determine if the component should be replaced, Symptoms of a Bad or Failing Heater Blower Motor Resistor. A drop down menu will appear. Click to see full answer Thereof, how do I know if my blower motor resistor is bad? The blower motor resistor is located on the back of the blower motor housing under the dash on the passenger side. Also if the blower motor has bad bearings, too much load blows the resistor pack. As the blower motor resistor is the component directly responsible for powering the blower motor, when it fails it major issues with the blower motor and the heating and air conditioning system can be experienced. Click on the icon for your Adblocker in your browser. Ads can be annoying. How do you change 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. Get rid of it! What is the most powerful handheld blower? The thermistor is located on the resistor assembly. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. Normal wear due to … I quickly found out the resistors are prone to failure, so I bought one. This page is for personal, non-commercial use. It only takes a few seconds. 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. This may have happened because it's very hot here in Ottawa, or because months ago I replaced a broken blower … I saw many Durangos with the connector and resistor already cut out. There are several symptoms that appear when the resistor of the blower motor is going bad. 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%. You will need to remove the kick panel on the passenger side to get at the motor. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. I turned on the heater and my blower resistor conked out again. When the blower motor fails, it will usually draw a lot of power from the electrical system and become very hot. The blower motor resistor is in charge of regulating the speed of the blower motor. 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. This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. On the low setting the resistors are larger taking more load - less to motor - slower speed. Blowerresistors are small parts that can become corroded or just burn out, and a new one often costs less than $50. Worst car I've ever owned! 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. 1. This can be annoying, but troubleshooting is easy. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. Then they buy a aftermarket blower motor and again it keeps burning up. Copyright 2020 FindAnyAnswer All rights reserved. Bad dirty loose connections to either power and/or ground will increase the current over the ratings of the resistors. 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. You still haven't turned off your adblocker or allowed our site. Russia's UAZ Patriot off-roader is coming to America as the 2022 Bremach Taos, The Aspark Owl, dubbed the fastest accelerating car in the world, is now on sale, Koenigsegg re-engineers a 2017 Agera RS at the request of a customer, 2021 Subaru Outback Review | Still marching to its own drum, 2021 Mercedes-AMG A 35 First Drive | The cheapest AMG, 2021 Alfa Romeo Giulia Review | Still the driver's choice. Failure to take this precaution may result in possible serious injury. Just so, can you test a blower motor resistor? 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. WARNING: The blower motor resistor may get very hot during normal operation. 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. Larry. It is responsible for controlling the blower motor’s fan speed. It can be difficult to get at. Weak airflow from the vents. Thanks for subscribing. What happens when a blower motor resistor goes bad? Select the option to run ads for autoblog.com, by clicking either "turn off for this site", "don't run on pages on this domain", "allow this site" or similar. Blower motor resistors can wear out; the blower motor no longer works correctly if this occurs. Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. Failure to take this … These cooling fins channel heat away from the internal electrical components. One of the first symptoms of a potential problem with the vehicle's heater blower motor is low airflow from the vents. Move the lead from terminal 2 to terminal 3 and check this reading against specifications. All rights reserved. A. The Dealer wants $700 to fix it. 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. Just purchased a new motor off Amazon. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35.00+. The blower resistor is connected in series with the blower fan. Installation is the reverse of the removal. Over time, that heat can cause the resistor to fail naturally. 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. The Ford blower motor resistor deployed on the automatic temperature control systems is larger and has aluminum heat sinks incorporated into the design. What's the best leaf blower on the market? If you back the speed down anymore, it gets even hotter and then starts pulsating the blower, Any time the blower motor is running the air flow helps cool the resistor coils. How much does it cost to play a round of golf at Augusta National? It's problem after problem. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. In reducing the blower motor fan speed, the blower resistor gets very hot. 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. What can cause a blower motor to stop working? Remove the screws or bolts to the blower motor resistor and remove the resistor. Don, I don't think I was too clear. My blower would only work on "4". Locate the blower motor resistor on the passenger side under the dash board. It is responsible for controlling the blower motor’s fan speed. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. If you start at the blower motor, and check resistance in the circuit, you will find the problem in no time. Disconnect the electrical connector to the blower motor resistor. I know it is the correct resistor for the CJ3 climate control, and it did bring back 1-4 on the motor switch. Asked By: Arne Grimmeissen | Last Updated: 19th April, 2020, Trent, one of the biggest reasons for blower motor, Set a digital multimeter for "ohms." Place one lead of the Ohmmeter on terminal 1 of the resistor. News, Reviews, Photos, Videos delivered straight to your in-box. 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. Eventually, it's this heat that's gonna' fry it. The resistor of the blower motor is responsible for transferring the electrical current that's required to move air through the vents of vehicle. However, as a side effect of reducing current flow, resistors generate heat. 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. Place the other lead on terminal 2 and check against specifications. Simple, neat. What are the signs of a bad blower motor? Can you do a Bob Ross painting with acrylic paint? 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. If little air is coming through the vents (hot or cold), then it could be because the blower motor for the fan or a switch or resistor that controls fan speed isn’t working. ©2020 Verizon Media.