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car blower motor troubleshooting

They do this for cooling purposes. Typically it's done by measuring the voltage at the blower motor connector when it's turned on. If it’s good, check for debris on the evaporator or heater. If you do see battery voltage, the problem is either a bad motor or a problem on the ground side of the circuit. Check for bad fuse or bad high speed relay. Swap the high speed relay with another relay with the same part number. The blower motor relay is the electrical switch that is used to supply the power for the vehicle’s blower motor. Blower motor doesn’t work in cold weather. Why do you need to know that? 1st covered under the 5 year warranty, second 0 … This is why at the bottom of the article we include a 2008 F150 blower motor wire diagram. With that said, failed blower resistor assemblies don't solve all of the possible failures. They mount the resister block in the air conditioner or heater case, because of the generous amounts of air flow. Make sure you check the connector side for damage. If the motor runs at full speed, you’ve confirmed the motor is not the problem. The reason I’m not including the motor resistor as a suspect is because it usually only controls the lower speeds. 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. 2. Is there a breaker or relay, and where is it located. A car heater blower is a part consisting of a DC motor driving a tangential fan, with the purpose of blowing air to control the internal environment of the car. 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. They include wiring diagrams and technical service bulletins. This is a dead ringer symptom of a bad blower motor resistor, not a bad speed switch. Restarted car after filling and the blower motor failed to work. If there is power, the motor is bad. If airflow seems restricted or lower than normal, check the cabin air filter. 1991 Ford F 150 Blower Motor Wiring Diagram. Check for airflow restrictions in the duct, paying attention to debris on the evaporator or heater core. Check for full airflow at the vents. The resister block used on many models is coupled with a control module. This is to prevent the circulation of ice-cold air on cold winter days when heat is selected on the climate control. Even better an automotive meter to verify good power and grounds at the blower motor. If the blower motor doesn't work at all, the blower motor itself must be tested first. DIAGNOSING THE PROBLEM Blower motor breakdown can be the result of anything from old age to failed bearings, high amp draw, electrical failure in the windings, dirt accumulation, and more. I also have a page focused on four GM HVAC issues on cars and trucks from the 2000s. A blower motor resistor is an adjustable resistor. If you have a variable speed blower motor, replace the blower motor speed control module. I checked all three fuse locations, the owners manual does not show a blower motor fuse, HVAC fuse is not blown. In fact, they sell a harness repair kit for a few bucks that you’ll need to fix the issue for good. Decreased airflow causes the blower motor resistor to overheat and fail. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. Tools and materials needed: – 4-in-1 screwdriver – Nut driver. RepairPal makes it easy to find a trusted mechanic to look under the hood for you. Replace blower motor. Cool Automotive Products and Tool Recommendations, Read AUTO REPAIR ARTICLES sorted by topic, Harsh shift, rough idle, GM service bulletin #PIP5446A, No start, no crank, start then stall on GM trucks, Custom Wordpress Website created by Wizzy Wig Web Design, Minneapolis MN. It’s possible to get a short circuit or burned-up motor that could produce smoke and burning smells, but get under the hood and make sure it’s not also something else. In most cases, they start to fail by making a high pitched squeal or screeching noise that indicates the bearing is failing. You can learn more about this auto repair website over at the Homepage for YouFixCars.com. Watch the example video below. In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. Or, carmakers can supply power to the motor and control blower speeds on the ground side of the circuit. Some drivers and car owners might complain about these normal operating conditions. At the bottom of this page is a video that’s very popular. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. If you don’t see good ground, locate the ground connection and clean it. If you have a three or four speed blower motor, remove the blower motor relay. With our wide variety of replacement AC heater blower motors, AutoZone can help make your ride enjoyable again - no matter what you drive. They always mount the interior fan near the evaporator and heater cores. Bookmark this automotive AC blower page or share. The control head then sends a command to the motor controller to change the speed to the driver’s preferences. Disconnect the negative and positive power supply. Replace the blower motor. Use a new furnace filter replacement to replace dirty filters that can block air flow The blower motor in your car is under the passenger side dashboard. The module uses that information to pulse either power or ground to the motor. If your test reveals power going into the resister with a solid ground present and nothing coming out, a failed component becomes likely. Replace the blower motor. This is a symptom of a failing blower motor bearing. Run a fused jumper from the battery to the power side of the motor and connect a temporary grounding jumper to the other motor terminal. The bearing is not replaceable. If the motor stops, replace the relay. The blower motor resistor assembly is a common malfunction on them. Blown fuses Disconnect the electrical connector. That saves a lot of time because you don’t have to refer back to the component locator or circuit locations. Select the department you want to search in. See the wiring diagram below for that setup. On vehicles with early climate control systems the fans may not activate until the engine reaches a specific temperature. There’s also a 30 amp Maxi fuse in the engine bay convenience center. To obtain the requested speed, the motor controller rapidly pulses the ground circuit on and off. Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. In most cases, their diagrams are right from the factory manuals. These resistor modules often fail from heat stress that can melt plastic connectors. That’s why they’re not far from the squirrel cage itself. Disconnect the electrical connector at 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. The squealing noise happens most often in the winter during cold startups and may disappear as the motor heats up. The primary difference is the type of inputs to the motor control. If you have a three or four speed blower motor, remove the … The ac blower motor is usually located in the AC duct housing or heater case assembly. See the wiring diagram below for a typical variable speed motor setup. If you check all the fuses and they’re good, the next recommended step is to continue diagnosis by using a test light. As more resistance is applied to the circuit the slower the interior fan motor will spin. 1. If the motor runs, locate the ground connection and clean it. This one has been a big issue over the years. Photo: familyhandyman.com. In a situation where the motor doesn’t work on any speed, the most likely causes are: a blown power supply fuse, a bad motor ground connection, bad motor speed control module or a failed motor. The diagnostic charts provided in car repair manuals are often very basic and servicing the parts doesn’t require any special tools. 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. 7 Awesome Reasons Why You Should Buy a Truck, Here’s Why You Should Consider Speakers From American Bass Audio, 4 Tips for Towing a Cargo Trailer From Start to Finish, The Most Important Tips for Buying Used Motorcycles. The plug the connector back into the motor and check operation. I shut the car off to fill with gas. This is a symptom of a failing blower motor bearing. Also, check the fuse for the control side of the high speed relay. Also, does your blower motor have just a 3 or 4 speeds or do you have a variable speed motor where you vary the speed by turning a dial? When I diagnose electrical problems, I start at the load and work my way back through the circuit towards the battery. 15. Check the blower motor at its two-wire connector for power. If so, you’re not alone. Alldatadiy.com, on the other hand, uses the factory diagrams. And off and that can melt plastic connectors resister assembly from a late 70s car. S used to control the air conditioning system of a faulty blower motor bearing if there no. Blower fan that only works car blower motor troubleshooting one speed, the blower motor is usually the.! Warm or cold air these parts in the winter during cold startups and may disappear as the controller! Problems remain the most common solution to interior fan motor will spin fans may not until... 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