Understanding Blower Motor Related Parts

A blower motor resistor is one of the most essential parts of a car's heating and air conditioning system. A Blower motor resistor is placed within the system of ducts or near the car blower, which can be found under the hood. The main purpose of a blower resistor is to regulate the speed of the blower fan that delivers air to a passenger compartment in a car. It is primarily designed to provide a voltage that is proportional to current, allowing the resistor to operate at a lower rate.

An issue with the blower motor resistor might turn into a major problem in your vehicle. Because your blower motor resistor is part of your car's temperature control system, it might influence your vehicle's capacity to circulate air.

A malfunctioning blower motor resistor might make it difficult to drive safely or comfortably if you can't warm or cool your car. A faulty blower motor resistor can be caused by a variety of factors. Some of the warning signals of a faulty blower motor resistor are as follows:

When you're attempting to get the heater or air conditioner to operate in your vehicle, one of the most obvious indications to look for is a lack of air moving through the vents. When you turn the knob or press the button to start the blower, the air doesn’t blow through the vents. This is a clear indication that the blower motor resistor has failed.

One of the most common signs of a faulty blower motor resistor is a jammed blower motor resistor. The blower motor resistor controls the speed of the blower motor fan. The blower motor may get stuck at a particular speed if the motor resistor fails. You can still use the heater or air conditioner, but you'll need to replace the blower motor resistor for it to work properly again.

If your blower fan doesn't turn off no matter what you do, and constantly runs regardless of how much you try to twist the blower switch to low or high or turn it up and down. This means that the blower motor resistor isn't regulating the electrical current properly. Hence, you need to replace the blower motor resistor as soon as possible.

Another common sign of a defective blower motor resistor is a blower motor that does not work in one or more settings. If the blower motor resistors' internal components break, the blower motor may malfunction or stop working altogether on one or more of the settings. A defective blower motor switch could cause the same problem, so a comprehensive diagnostic is essential if you're not sure what's wrong with your blower motor.

The blower wheel, also known as the blower motor wheel, is a part of the blower motor system that is responsible for moving high amounts of air through the duct system of the heat and air conditioning system. The strong outer covering that protects the central disc and blower fan of the blower motor system is called the blower wheel. Blower wheels are made of cold-rolled galvanized steel, which is rust and corrosion-resistant. Because of their unique design, blower wheels are robust and provide long-lasting performance.

A device called the blower wheel works within your heating or cooling system (mounted on the shaft of the blower motor). To keep you comfortable, the blower wheel which is a part of the blower motor circulates massive amounts of warm or cold air through your ducts of heat and air conditioning system. If the blower motor or wheel is broken or wears down over time, it can stop working, causing your heat ventilation and air conditioning system to break down.

There are various reasons for the blower wheel to fail.  Accumulation of dirt and dust can contaminate your blower wheel over time, slowing it down. Blower wheels can also become imbalanced, resulting in vibration, metal fatigue, and failure. Blower motors can fail due to electrical problems, excessive energy use, or worn bearings caused by an imbalanced blower wheel. In either of the scenarios, a new blower motor and wheel is  required.

The blower motor may draw up to 20 amps of electric current or more at high speed due to the volume of air the blower fan carries. A 20-amps, 25-amps, or 30-amps blower motor fuse is positioned in the fuse panel behind the dash to safeguard the blower motor power circuit. The blower motor fuse's rating is determined by the amount of power required by the blower motor at full speed.

The objective of the blower motor vent tube is to draw cold air into the blower motor to keep them safe from overheating. The blower motor vent tube connects the evaporator and heater to the blower motors.

A blower motor relay, also known as a blower relay, is an electrical switch that supplies electricity to the vehicle's blower motor. A Blower motor relay provides the electricity that permits the fan to circulate heated air. The blower motor relays are essentially on/off switches that start and stop the heating process in HVAC systems by managing the passage of current between the power source and the blower motor.

The current utilized to power the blower motor is controlled by the blower motor relay, which is subject to constant on and off switching. The blower motor relay may wear out over time. When the blower motor relay fails, the vehicle normally exhibits several symptoms which are:

The Blower motor not working is one of the first signs of a problem with the blower motor relay. Because the blower motor relay is a  switch that sends current to the blower motor, if it fails internally, power to the circuit will be turned off, causing the blower motor to stop working and the vents to stop blowing air.

Another symptom of a bad or failing blower motor relay is a blown AC blower motor relay circuit fuse. The blower motor fuse can explode if the blower motor relay experiences an issue that prevents it from correctly limiting and distributing power. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power to protect the system.

A burned or melted relay is another extremely dangerous symptom of a problem with the blower motor relay. Blower motor relays are subjected to high current loads and can get heated when they malfunction. During high-temperature circumstances, the relays may overheat to the point where the inside components and plastic housing of the relay will melt and burn, causing damage to the fuse box or panel as well.

Because the blower motor relay is effectively a switch that regulates electricity to the blower motor, if the blower motor relay fails, the entire air conditioning system will be unable to distribute cooled or heated air. if you suspect the above symptoms replace your blower motor relay as soon as possible.