ECM X13 Blower Motor Troubleshooting!8:06. Make sure the ground side of the high speed relay is working. Is there a breaker or relay, and where is it located. When I diagnose electrical problems, I start at the load and work my way back through the circuit towards the battery. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. They mount the resister block in the air conditioner or heater case, because of the generous amounts of air flow. This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. No noise, no prior problems. This is usually the case after a blower resistor failure on one or more speed settings. With that said, failed blower resistor assemblies don't solve all of the possible failures. A variable speed motor is controlled by a digital speed controller. However, you’ll probably find it uncomfortable to have the blower running at one speed setting the entire time. See the wiring diagram for that setup below. A resister block will adjust its total resistance as selected by the driver from the switch. If airflow seems restricted or lower than normal, check the cabin air filter. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. Replace the blower motor. I participate in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com. 1991 Ford F 150 Blower Motor Wiring Diagram. This is to prevent the circulation of ice-cold air on cold winter days when heat is selected on the climate control. Based on the driver’s input to the blower speed switch, the HVAC control head sends a digital signal to the blower motor speed control module. Or, carmakers can supply power to the motor and control blower speeds on the ground side of the circuit. These resistor modules often fail from heat stress that can melt plastic connectors. If you’re tracking down a wiring issue, Eautorepair.net is the better choice. This can be a bad blower motor resistor or a failed speed switch. Disconnect the electrical connector at the blower motor. Thread starter Buzzie8; Start date May 9, 2009; B. Buzzie8 Member. In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. The heater blower motor is located behind the glove compartment of your vehicle. Locate the retainer clip in the center of the blower wheel. Special Note: I put together a separate blower motor problems page for Chrysler and Dodge owners. 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. (The black wire is usually the negative.) They often locate these parts in the heater case near the blower motor. Checked for battery at the blower, when the car is running. However, when it comes to the interior fan I will usually go right for the fuse and check that first. When that happens, you lose that speed. Its a good idea to check other like models to determine if there is a problem, or is it just operating as per design intent. I shut the car off to fill with gas. If you have a variable speed blower motor, replace the blower motor speed control module. Remove the screws, and swap out the resistor module. Blower motor is drawing too much power. Many, many times a car or truck will come into the shop with the customer complaining that their blower motor doesn’t work, or only works on high speed, etc. This electrical component is used to control the air conditioning system of a vehicle. Next I’ll head to the resister block assembly and check for power coming out of the resister itself. You’ll have to decide on your own if this is within your skill level. If it’s in the engine bay you’ll most often find it near the firewall. Use a multimeter to check for the presence of voltage in the connector with the key in the RUN position and blower speed set to HIGH. To do this, go to each of your home vents and ensure they are open and clear. You can learn more about this auto repair website over at the Homepage for YouFixCars.com. I'm thinking there would be no reason for Mercedes to design a whole new blower motor, just the housing, but I'm thinking maybe the actual blower is the same as Mercedes uses on some other cars, maybe even all the Germans share the same supplier. Acts like a fuse is blown. Common Problems with Blower Motors. This is a symptom of a failing blower motor bearing. Be careful, on some vehicles when the engine is running the interior fan is in constant operation at a low speed. It is an integral part of the air condition system, which is capable of blowing warm or cold air. Disconnect it from the motor shaft and set aside. Disconnect the negative and positive power supply. A third quick and simple troubleshooting step for your furnace blower motor is to make sure the filters and vents are clean and free of dust and debris. I checked all three fuse locations, the owners manual does not show a blower motor fuse, HVAC fuse is not blown. The most common symptom of a faulty blower motor resistor is a blower fan that only works on one speed, usually high. There are 4 screws that hold it up under your dash. Some drivers and car owners might complain about these normal operating conditions. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. As more resistance is applied to the circuit the slower the interior fan motor will spin. Watch the example video below. This can be annoying, but troubleshooting is easy. You can find this tutorial in Spanish here: Verificando el Motor del Soplador del Aire Acondicionado (4.0L Ford) (at: autotecnico-online.com). If you ignore the noise, the bearing will continue to wear to the point where the motor won’t start at all. Replace the blower motor. Depending on the year, make, and model you may find this component both in the interior cabin area or outside in the engine compartment side of the firewall. Disconnect the electrical connector at the blower motor. Check for airflow restrictions in the duct, paying attention to debris on the evaporator or heater core. It’s used to control the output speed of the blower motor. 15. Blower motor doesn’t shut off. Using the above troubleshooting steps will help you decide if you need to replace your air conditioner blower motor. Check the blower motor at its two-wire connector for power. Purchase a new resistor module at the auto parts store (usually less than $25). Make sure you check the connector side for damage. The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. It reviews best practices for diagnosing common electrical problems. The control head then sends a command to the motor controller to change the speed to the driver’s preferences. They do this for cooling purposes. Fixed the problem. Pictured on the right is an interior fan resister assembly from a late 70s GM car or light truck. I have a 2001 Nissan Quest. How Often Do Brake Rotors Need to Be Replaced? If you don’t see good ground, locate the ground connection and clean it. A month later the blower motor stopped working and I replaced that and it worked fine. Location diagrams will also point out important parts in the climate control system such as relays, switches and fuses. The connector on your Ford's blower motor will have a BRN/ORG wire and a PNK/WHT wire. Heat damage the component directly responsible for controlling the blower, from the switch can supply power to the is... 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