", "Randy was wonderful! Usually a bad or failing heater blower motor will produce a few symptoms that can alert the driver of a potential issue. Usually a bad or failing heater blower motor will produce a few symptoms that can alert the driver of a potential issue. You might hear this as a noise coming from directly behind the vent, perhaps a light slapping, or a sudden pop before you notice a problem with airflow. Symptoms of a Bad or Failing Heater Blower Motor Resistor. They're fast, friend...", Simple Ways to Keep Your Tire Full When You Run Over a Nail, Warning Signs That Your Brakes Are Overheating. If the resistor isn't replaced for some time after starting to act up, it may fail completely, leaving the entire system useless. You might also notice the air blowing at certain speeds, but not all of them. Intermittent Operation. If your blower motor is dirty or has a bad capacitor, you can call in an HVAC technician to fix the problem. The motor wears out over time, and canât push as much air, leaving you wondering what happened to the air power. This system is made up from a number of smaller components, including the blower motor, which acts as the main electric motor for the HVAC system that pushes air through all the vents. Required fields are marked *. This also decreases the efficiency of the defroster, as it uses the same fan. I have used them for several major repairs on my old truck and they did an awesome...", "Me and my family have used Larry's company many times over the years and I've always been delighted with the results. If the fan does not turn on at all when the air conditioner or ⦠ãBad SymptomsãA bad or failing blower motor resistor hampers the efficiency of the heating and air conditioning system. air conditioning system, blower motor, blower motor replacement, climate control, fan, heating problems. As the impeller blades are plastic, it’s also pretty easy for them to snap off. 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The most common symptoms include: 1) Blower fan gets stuck on one speed setting; 2) Blower fan cannot access certain speed settings; 3) No air comes out of the vents. The resistor enables the heater blower motor to change the speed of the fan. At high speed, the resistor is bypassed, and power comes directly from the switch. Of course, your climate control systems can fail in many ways, so it’s good to be able to identify the signs of a bad blower motor and get it taken care of without replacing a bunch of other perfectly good parts. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. Won â t move to efficiently handle heat problems different speed settings can help the motor to efficiently heat. Blower motor stuck on one speed This is an example of how resistance and current work in a circuit. If you ever notice smoke or a burning smell while driving, you should pull over immediately. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. If you have a blower motor that is no longer functioning properly, you will also be left with a heating and/or cooling system that does not work. High-Performance Brake Fluid: What Is It and Who Needs It? Your email address will not be published. If any of the electrical contacts on the inside of the switch wears out or breaks, then the switch may be disabled in that position and that particular setting for the blower ⦠All Rights Reserved. Symptoms of a bad Blower motor resistor has gone haywire in your so!, then the needle won â t move are designed to be subjected a. This is a telltale sign of a bad blower motor. Fortunately, there are signs that clearly indicate when a blower motor is starting to go bad, so you should be able to fix the issue before it becomes a major problem by visiting a mechanic in New Palestine, IN. Definition 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. Your email address will not be published. The motor wears out over time, and can’t push as much air, leaving you wondering what happened to the air power. No air blowing through vehicleâs vents A rarer symptom may include a strange noise coming from your blower motor. For Ford cars and trucks without ATC (Automatic Temperature Control) systems diagnosis becomes simpler. Or there might not be air coming out at any speed. The resistance gradually decreases, and current increases as the resistor moves from Low to Medium to Medium-High. If you find a blown fuse in the blower motor circuit, that’s a clue that the circuit became overloaded. Without this part you will not be able to change the speed of the airflow from the blower motor. One of the first signs of blower motor failure is weak airflow. Because your heater blower motor resistor is part of your carâs climate control system, your ability to keep air circulating within your vehicle can be affected. It uses resistance to control the speed of the blower motor. If there is a short of some kind around the blower motor resistor and wires start melting the fan could blow the smoke from those melting wires back into the cabin of your car. On the other hand, if your motor is reaching the end of its service life, you should start looking for a replacement motor. © Copyright National Automotive Parts Association. In her downtime she enjoys backpacking wherever her boots will carry her, rock climbing, experimental theatre, a crisp rosé , and showering love on her 2001 Sierra truck. Automotive expertise from NAPA AUTO PARTS. LOL Sorry Larry!! What are the symptoms related to a bad heater blower motor resistor? 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