There are several symptoms that appear when the resistor of the blower motor is going bad. This is an unlikely symptom of a bad blower motor resistor, but it’s not impossible. So, if you are experiencing these symptoms, your blower motor resistor may be bad or failing: If the airflow from the vents is weak… If you try to increase the air pressure and you feel no difference in the pressure blowing, then your blower motor resistor may be failing. 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. A bad furnace blower motor will have several symptoms. These are the most common problems and symptoms associated with blower motor resistor problems: HVAC fan doesn’t work at all In BMW cars, the blower motor resistor often overheats due to incorrect current measurements implemented during the design and engineering of the vehicles. One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function at all. You might also notice the air blowing at certain speeds, but not all of them. One of the first symptoms commonly associated with a bad or failing blower motor switch is a switch that only works on certain settings. When the resister of the blower motor starts to fail, the motor operates only … 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. The resistance gradually decreases, and current increases as the resistor moves from Low to Medium to Medium-High. The most common symptoms include: 1) The blower fan gets stuck on one speed setting; 2) The blower fan cannot access certain speed settings; 3) No air comes out of the vents. Whirring noises might also result from a bad bearing in the motor. Won ’ t move to efficiently handle heat problems different speed settings can help the motor to efficiently heat. If you have the misfortune of getting into your car and discovering it has, this repair is something you’ll want to take care of sooner rather than later. This is a telltale sign of a bad blower motor. Your email address will not be published. Not only will this reduce the comfort level inside your cabin, but it could also prevent some other important systems from working, such as the front or rear window defrosters. How to Reset an Oil Change Light After Maintenance. As the impeller blades are plastic, it’s also pretty easy for them to snap off. If your blower motor is dirty or has a bad capacitor, you can call in an HVAC technician to fix the problem. This Simple Hack Lets You Shift to Neutral, How To Use Sea Foam: Three Ways To A Cleaner Fuel System, If Your Car Battery Won't Hold a Charge, Try These 4 Steps, How to Jump-Start a Diesel Truck With Two Batteries, 4 Common Brake Light Problems and How to Solve Them, BMR Announces 2021 Lineup with Love, Moore, Bill McAnally Racing Earns Tenth Series Title, Elliott Races to First NASCAR Cup Series Championship with Win at Phoenix, Sweet Crowned 2020 World of Outlaws Sprint Car Series Champion, Ron Capps Closes 2020 Season with Final-Round Appearance and Fourth-Place Ranking. The most common symptoms include: The blower fan gets stuck on one speed setting A working resistor can shift between speed settings according to the user’s preference. Because your heater blower motor resistor is part of your car’s climate control system, your ability to keep air circulating within your vehicle can be affected. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. It is also possible that the heater motor blower may not work at all. Blower motor stuck on one speed When the blower motor resistor fails, the air conditioner and heater may still work, but air may blow from the vents at only some of the fan speed settings.. Failing Oil Pressure Sensor? Save my name, email, and website in this browser for the next time I comment. Blower motor resistors can wear out; the blower motor no longer works correctly if this occurs. If the resistor isn't replaced for some time after starting to act up, it may fail completely, leaving the entire system useless. 2. The blower motor is an important part of your vehicle’s heat and air conditioning systems. For Ford cars and trucks without ATC (Automatic Temperature Control) systems diagnosis becomes simpler. At high speed, the resistor is bypassed, and power comes directly from the switch. Symptoms of a Bad or Failing Cooling Fan Relay / Heater Blower Motor Resistor Engine running hot One of the first symptoms commonly associated with a bad or failing cooling fan relay is an engine that runs hot or overheats. Blower motor stuck on one speed. A rarer symptom may include a strange noise coming from your blower motor. 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. No air blowing through vehicle’s vents Blower motor does not work on certain settings Your email address will not be published. What are the symptoms related to a bad heater blower motor resistor? Required fields are marked *. Also, with the engine off but key in, see if the smoke and smell increase when the air is set to high. A common symptom of a faulty blower motor resistor is a blower … This also decreases the efficiency of the defroster, as it uses the same fan. On the other hand, if your motor is reaching the end of its service life, you should start looking for a replacement motor. Weak airflow from the vents One of the first symptoms of a potential problem with the vehicle’s heater blower motor is low airflow from the vents. Your email address will not be published. What are the symptoms related to a bad heater blower motor resistor? Though generally not a safety concern, a broken blower motor can greatly reduce the comfort of your ride in hot or cold months. If the resistor isn't replaced for some time after starting to act up, it may fail completely, leaving the entire system useless. Save my name, email, and website in this browser for the next time I comment. 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 … Your email address will not be published. As the relay is the switch that supplies current to the blower motor, if it fails internally, then power will be cut off from the blower motor circuit, causing the motor to no longer function or blow any air from the vents. Just about every vehicle that gets operated on a roadway is outfitted with an interior HVAC system that keeps you and your passengers comfortable on your ride. If it does seem to be an electrical problem with the fan or circuit, turn the air off and take the vehicle to a qualified mechanic for repair as soon as possible. http://www.wellsve.com/ This video demonstrates how to interpret the wiring scheme for the blower system on a late model GM truck. Symptoms of a Blown Blower Motor March 4, 2019 10:28 pm Published by Writer Leave your thoughts. Blower motor does not work on certain settings. 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. 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. You might also notice the air blowing at certain speeds, but not all of them. 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. And seeing as they’re not terribly difficult to replace, it makes sense to get it taken care of ASAP instead of forcing yourself and your passengers to suffer though extreme temperatures. 1. This motor is controlled by a part called the blower motor resistor and switch, and is capable of working at a variety of speeds to provide different temperatures throughout the cabin. First we'll cover the most common symptoms associated with a bad Ford blower motor resistor. A problem with your heater blower motor resistor can be a serious issue. They're fast, friend...", Simple Ways to Keep Your Tire Full When You Run Over a Nail, Warning Signs That Your Brakes Are Overheating. 1. This also decreases the efficiency of the defroster, as it uses the same fan. If you find a blown fuse in the blower motor circuit, that’s a clue that the circuit became overloaded. Blower Motor Replacement: When Good Parts Go Bad Winter is obviously the worst time for your heat to give out. If the resistor isn't replaced for some time after starting to act up, it may fail completely, leaving the entire system useless. 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