Ford Mechanic: drobbi , auto mechanic replied 13 years ago OkCustomer It sounds like your blower has gone out, Or power to the blower is not not working. 3. Over time, the heater blower motor ⦠This means that the current running through the blower motor, and thus is speed is controlled by the resistor value. The blower motor resistor is constantly put under stress which can cause it to eventually fail. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Blower motor resistors can wear out; the blower motor no longer works correctly if this occurs. Ford blower motor resistor problems remain the most common solution to interior fan malfunctions on Ford cars and trucks. SYMPTOMS OF A BAD BLOWER FAN MOTOR RESISTORIn this video we will explain the symptoms of a bad blower motor resistor. Conduct an amperage draw test at the same time to rule out excessive current draw from the blower motor. The heater blower motor resistor in your car leads a hard life. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Honda alternator and charging systems explained, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. Well, my friend did. They include wiring diagrams and technical service bulletins. Blower motor resistors can wear out; the blower motor no longer ⦠Blower Motor Resistor Thermal Fuse Replacement: Have you ever started your car up in the morning only to realize that your heater fan doesn't work on any of the slower settings but does work on high speed? So you have to refer to the factory legends to learn the identification symbols and then refer back to circuit diagrams to find the splice and ground locations. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. 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. On many vehicles, the blower motor resistor, which comes as a module that connects to an electrical wire and is mounted near the blower motor, is accessible by ⦠Note that this could also be a problem with the resistor, air door actuator or a couple of other components, so get it diagnosed by a mechanic to be sure. Not as common as the other way around. It starts out slow and you figure there is something wrong with resistor, resistor connector (which melted) or the blower motor's old, or they-don't-make-these-blower-motors-like-they-used to. A common symptom of faulty blower motor resistor is when the heating and air conditioning blower only operates at high speed and cannot be adjusted to low speeds. Blower motor resistors are susceptible to a handful of problems that will affect their performance. Signs & Symptoms of a Bad Blower Motor Resistor. It is responsible for controlling the blower motor’s fan speed. In some cases, the heat is so high that it melts the connector. Without fixing, your car may overheat. However, other factors can cause the blower motor resistor to fail prematurely. Common signs include cooling fans running for a long time or not at all, as well as weakened air flow. However, as a side effect of reducing current flow, resistors generate heat. I think it needs a new resistor, but the shop says the fuses should take care of it. YourMechanic All rights reserved. This can also be caused by a failed blower motor resistor or switch, so having the vehicle properly diagnosed is highly recommended. There are several symptoms that appear when the resistor of the blower motor is going bad. Blower motor resistor - bad part or something else? See the image below. At high speed, the resistor is bypassed, and power comes directly from the switch. If the blower motor became undesirable, you does not have had that slow relief in fan speeds. A few months ago I was driving home when I noticed nothing coming out of the fan on speed 2. Recognising these symptoms and replacing the resistor returns the airflow through the car to the proper levels. This is common on late model GM vehicles. For example. The blower motor resistor is a small electrical component that can cause noticeable issues with the passenger compartmentâs air when it fails. A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system. Many car makers use a blower motor resistor in conjunction. Symptoms of a Bad or Failing Heater Blower Motor Resistor. Over time, that heat can cause the resistor to fail naturally. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manuals—period. For example. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. If the amp draw exceeds manufacturer’s specifications, replace the blower motor. If you discover a melted connector, do NOT attempt repair. Common signs include the car's heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. Eautorepair.net redraws factory wiring diagrams in color and includes the component, splice and ground locations right in their diagrams. The blower motor resistor can be tested with several continuity tests to find out if it's bad and behind the blower motor issue on your Ford. 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. Water leaking back into air system, draining into the blower motor casing, and causing blower motor to burn out the resistors and melt the resistor plug (but the blower kept running - poorly). In that case, the blower motor resistor will fail repeatedly. When the blower motor resistor fails, 1 of the 3 or all 3 first speeds stop working. For instance, moisture can get to a blower motor resistor and cause it to corrode. My blower motor, when driving, goes from high to low without me adjusting anything. The resistor of the blower motor is responsible for transferring the electrical current that's required to move air through the vents of vehicle. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. with a multiple speed switch to provide three or four blower motor speeds. In most cases, their diagrams are right from the factory manuals. If water spray enters the system, it can quench the hot resistor wires, causing them to break. Another common symptom of a faulty blower motor resistor is a a blower motor that does not function on certain settings. This is a telltale sign of a bad blower motor. It must handle not only the power demands of the fan when you are driving, but it also has to absorb and dissipate tremendous amounts of heat as a byproduct of its normal operation. During the summer, you need air conditioning to ensure comfort and safety, and during the winter, you’ll need heat for the same reason. If you need to dig into your doors, dash or console, Alldatadiy.com is the better choice because Eautorepair.net doesn’t any interior or exterior trim or body part removal. In that case, the blower motor resistor will fail repeatedly. Our certified mobile mechanics make house calls in over 2,000 U.S. cities. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. This can also be caused by a blower motor switch, so a proper diagnosis is highly recommended if you are uncertain of what ⦠However, different cars... Over time your car A/C system can start to smell unpleasant. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. Resistance Is (Not) Futile It sounds like the blend door may be stuck. Speed 1 didn't work, either. If the switch itself seems to be hard to turn, it is likely cable driven and experiencing a restriction.... determine if the component should be replaced. 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. Usually a bad or failing blower motor resistor will produce a few symptoms that can alert the driver of a potential issue. 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. 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. If you’ve replaced a blower motor resistor and that replacement has failed, it’s time to conduct an amperage test on the blower motor. A potential issue wiring issue, Eautorepair.net is the component, splice and ground locations right in their.! Blend door may be faulty malfunctions on ford cars and trucks regulate the motor directly from switch! 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