In those applications, the HVAC control head is a digitally controlled unit and uses various sensor inputs to determine when to supply heat. This is to provide an ample supply of fresh air in the interior compartment even when no climate control mode is selected. Replace the resistor. Unscrew all the screws on the blower motor. See the wiring diagram below for that setup. As more resistance is applied to the circuit the slower the interior fan motor will spin. Start by checking the blower fuse and HVAC controller fuse. Get the BEST auto repair information Alldatadiy.com and Eautorepair.net are professional-grade shop manualsâperiod. Check for full airflow at the vents. Blower motor doesnât shut off. The replacement of parts in the blower motor system are some of the easier repairs to perform on the automobile. Variable speed blower motors donât use a blower motor resistor. If it doesnât, the motor is bad. If you have a three or four speed blower motor, remove the blower motor relay. This can be annoying, but troubleshooting is easy. The reason Iâm not including the motor resistor as a suspect is because it usually only controls the lower speeds. Reconnect the electrical connector and youâre car heater blower motor is back in business. Replace blower motor. How Often Do Brake Rotors Need to Be Replaced? One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. It could also smell like burnt hair. However, Alldatadiy.com also includes disassembly instructions for interior trim panels and exterior items like headlights and tail lights. ECM X13 Blower Motor Troubleshooting!8:06. Purchase a new resistor module at the auto parts store (usually less than $25). The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the motor stops, replace the relay. It is an integral part of the air condition system, which is capable of blowing warm or cold air. Swap the high speed relay with another relay with the same part number. The primary difference is the type of inputs to the motor control. You’ll have to decide on your own if this is within your skill level. Often there are two separate circuit fuses and they can be in separate panels. Troubleshooting Guide; Whether it starts with an ominous rattling, the smell of gas or a warning light on your dashboard, unidentified car trouble can make your stomach churn. Blower motor problems can cause many driver complaints. Disconnect the negative and positive power supply. The module uses that information to pulse either power or ground to the motor. A lack of airflow from your vents is a clear indicator that it may be time for a heater blower motor replacement. These resistor modules often fail from heat stress that can melt plastic connectors. 1. On vehicles with early climate control systems the fans may not activate until the engine reaches a specific temperature. What Is the Average Cost of a Car Accident? No noise, no prior problems. Watch the example video below. The highest blower speed usually bypasses the motor resistor completely, so itâs not a suspect if the motor doesnât work at any speed. Location diagrams will also point out important parts in the climate control system such as relays, switches and fuses. When I diagnose electrical problems, I start at the load and work my way back through the circuit towards the battery. The ac blower motor is usually located in the AC duct housing or heater case assembly. Blower motor doesnât work in cold weather. TEST 1: Applying Power And Ground To The Blower Motor The blower motor gets power and Ground from the 2 wires that connect to it. As an example on GM cars from the 80s and 90s there’s a 20 amp under the dash. In a situation where the motor doesnât 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. To obtain the requested speed, the motor controller rapidly pulses the ground circuit on and off. Even better an automotive meter to verify good power and grounds at the blower motor. Itâs 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 itâs not also something else. With the amount of current or amps flowing through this circuit, spikes can easily take out the fuse and damage relays. Place them in small container. A resister block will adjust its total resistance as selected by the driver from the switch. Refer to the wiring diagram for your vehicle and check for continuity on all three resistors and speed switch setttings. If you get a good ground reading, the problem is most likely a bad motor. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. If itâs good, refer to a wiring diagram for your vehicle and conduct these tests: Disconnect the electrical connector at the blower motor and jumper power and ground to the motor, bypassing all the speeds controls. Rotated all the PDC relays around, they have the ⦠Replace the blower motor. Reduced airflow also causes the blower motor to work harder, draw more current and that can cause repeat blower motor resistor failures. 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. On all systems, a failed blower motor is least likely. If your test reveals power going into the resister with a solid ground present and nothing coming out, a failed component becomes likely. Decreased airflow causes the blower motor resistor to overheat and fail. A burned blower motor or motor wiring isnât going to total your car, but you better be sure thatâs where the smoke is coming from before continuing on the road. If you donât see good ground, locate the ground connection and clean it. They often locate these parts in the heater case near the blower motor. Remove the screws, and swap out the resistor module. I believe General Motors first used it in the 70s. In most cases, their diagrams are right from the factory manuals. The resistors are arranged in series to reduce the voltage in steps, depending on where in the series you apply power. The motor should run on high speed. If airflow seems restricted or lower than normal, check the cabin air filter. Pictured on the right is an interior fan resister assembly from a late 70s GM car or light truck. However, youâll probably find it uncomfortable to have the blower running at one speed setting the entire time. 3 months ago I replaced the blower motor resistor because it only worked on high. I checked all three fuse locations, the owners manual does not show a blower motor fuse, HVAC fuse is not blown. Variable speed motors are most often used in vehicles with automatic climate control. Make sure you check the connector side for damage. âThe most common cause is dirt accumulation due to lack of maintenance,â said Tom Beaulieu, president of Bay Area Services Inc. in Green Bay, Wisconsin. Replace blower motor. The easiest way to check for a failure is to start the vehicle and turn the climate control on. 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. See the wiring diagram for that setup below. Disconnect the electrical connector at the blower motor. I shut the car off to fill with gas. Testing the blower motor is as simple as applying battery power and Ground to the blower motor terminals. On average, a Carrier blower motor replacement costs 0-0. Is there a breaker or relay, and where is it located. The control head then sends a command to the motor controller to change the speed to the driver’s preferences. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. If you start at the blower motor, and check resistance in the circuit, you will find the problem in ⦠Hyundai Blower Motor Infiniti Blower Motor Isuzu Blower Motor Jaguar Blower Motor Jeep Blower Motor Kia Blower Motor Land Rover Blower When it comes to climate control problems, a busted HVAC blower motor is a big one. A resister block will adjust its total resistance as selected by the driver from the switch. You can use the component location diagram in your online service manual to pinpoint the specific location of the squirrel cage (fan blades). Using the above troubleshooting steps will help you decide if you need to replace your air conditioner blower motor. Decreased airflow causes the blower motor resistor to overheat and fail. Fixing your own problems in this system is usually well within the reach of the average do-it-yourself mechanic. The bearing is not replaceable. Why do you need to know that? 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. 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