The power to the blower motor is fed throughout the blower motor resistor. Common signs include the car's heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. 95% of the time, the no blow of the AC will be caused by a bad blower motor. The compressor clutch relay on these vehicles are a known cause of sticking on the compressor clutch and overheating the A/C compressor clutch coil. 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. Place two large straight pins in the plug of the blower motor but leave the blower motor plugged in. This also decreases the efficiency of the defroster, as it uses the same fan. The blower motor resistor is an electrical component that is a part of the vehicle's heating and air conditioning system. In most cases, a blower motor resistor fails due to … The most common symptoms include: The blower fan gets stuck on one speed setting A working resistor can shift between speed settings according to the user’s preference. YourMechanic All rights reserved. Thanks for that. In that case, the blower motor resistor … Blower motor does not work on certain settings Click on the icon for your Adblocker in your browser. A/C Blower Motor Resistor. The The average car today contains a bewildering range of sensors that feed information to various computers to monitor everything from air intake to emissions and engine timing. Open hood and look on fire wall passenger side, should see blower motor, resistor pack is either right on top of motor or a big harness connector on the firewall, similar to how it is on other Ford trucks. View Profile View Forum Posts Private Message View Articles View Gallery Uploads Moderator Join Date Oct 2008 Location Kerrville, TX Posts 6,087. If this does not have the proper voltage going to it, this may also cause... Hello! SteelHeadz. Symptoms of a Bad or Failing Ambient Temperature Sensor (Switch). Worn blower motor causes repeat blower motor resistor failure. Our certified mobile mechanics make house calls in over 2,000 U.S. cities. That seemed to fix the problem and cause a new one. As you know this also contributes to the regulation of air flow into the throttle body. 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 is responsible for controlling the blower motor’s fan speed. As temperature conditions within the car can vary so greatly, a variable speed blower motor can be controlled through a several selectors, linked to resistors and relays. In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. Made with ♥ in Silicon Valley. There are several symptoms that appear when the resistor of the blower motor is going bad. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. Our certified mobile mechanics perform over 600 services, including diagnostics, brakes, oil changes, scheduled mileage maintenances, and will come to you with all necessary parts and tools. Your car’s air conditioning system also contains a couple of sensors that... You’ve parked your car, and are sitting inside waiting. Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, Over 25,000 topics, from beginner tips to technical guides, Check cars for recalls, common issues & maintenance costs, Hand-picked, community-rated professionals, Our mechanics make house calls in over 2,000 cities, Explore nationwide job opportunities for automotive technicians, Trusted mechanics, rated by thousands of happy car owners, Fleet maintenance with certified mobile mechanics. But with a bad capacitor, your blower cannot function well and may put your family’s comfort at risk. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. If you'd be so kind as to allow our site, we promise to keep bringing you great content. How Long Can I Leave the AC on While My Engine Is Not Running. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. 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. When the resister of the blower motor starts to fail, the … Get service at your home or office 7 days a week with fair and transparent pricing. A drop down menu will appear. 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 failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system. You must be logged in to perform that action. The motor wears out over time, and can’t push as much air, leaving you wondering what happened to the air power. Check your in-box to get started. The blower motor that controls air flow into the passenger cabin is among the most consequential components in the climate control system. 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