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In every home or vehicle, an HVAC system is a must-have. With changing seasons, from summer to winter, an HVAC system is the most depended on the device.
In every HVAC system, there is a component known as a blower motor. This blower motor is responsible for blowing heated air through your vents when the heating system is on. The motor is also responsible for blowing cold air through your vents.
This type of motor blows air at a constant speed.
This motor blows air at varying speed levels.
With the need to maintain comfortable temperatures within your home or vehicle, the HVAC is a vital component to have.
The motor works together with your home’s cooling and heating system; a thermostat monitors your home temperatures.
When the temperature falls below your thermostat setting, it sends signals to the furnace, which in turn starts to work. The furnace works by creating cold or hot air, which circulates to various rooms in your home.
The blower is responsible for circulating the cold or hot air created by the furnace throughout your house to ensure your temperature reaches the thermostat. The blow motor makes this possible by spinning a fan.
The fan, in turn, blows the cold or heated air through your ventilation system. The small-sized blower motor can move large air volumes. The thermostat is also responsible for communicating to your HVAC’s blower motor to either turn it on or off.
Between the single speed and the variable-speed motors, the best type of blow motor preferred is the variable-speed motor. The single-speed motor always resorts to cold sports as it only works when signaled by the thermostat.
The variable-speed motor, on the other hand, maintains comfortable temperatures throughout as it blows cool or heated air at varying speeds.
If you experience some of these problems with your HVAC system, it can only mean your blower motor is faulty and may need testing. Some of the symptoms of a defective blower motor are:
If you are not experiencing air from your vents when the air condition or the heated system is on, it might be faulty. When your blower motor is faulty, then it means no air will be circulated, and thus the need for testing or replacement.
If you experience weak or less airflow in your vents, then this can mean your blower motor is failing. A weakened or faulty blower motor cannot create enough airflow to regulate your cabin’s temperature.
Another symptom to identify a broken blower motor is if the motor functions at only a certain speed. The majority of blower motors are created to work at different speeds to regulate different house temperatures correctly. If your blower motor is unable to push cold or heated air at its designed settings, it means it’s faulty.
If you are experiencing some of these signs, you need to…
A volt-ohm meter or commonly known as a multimeter is a tester that measures electrical, current, voltage, resistance, and other values.
The multimeter is mostly used to calibrate voltage usage and resistance in your home’s machinery. It is highly recommended for anyone not sure which digital multimeter to use. It is the ideal tool for armatures.
Measures electrical flow using in-build tools.
With the ability to measure: Flow of Electricity, Voltage, Power Consumption, Wattage, and Amps, this device is recommended for professionals.
Before you start performing any test, it is advisable to first:
When your electrical devices are completely failing, the first thing to do is to make sure they are accessing incoming power.
If the power is incoming, but your blower motor is still not functioning, your next step should involve taking off the cover panels to look at the motor directly. If there is debris, then this is a symptom that your motor has a short. Cleaning the motor can make it function again.
The blower motor in your car is usually located behind your vehicle’s glove compartment. Disconnecting the positive and negative power supply is the first thing to do.
The black wire is normally negative. With your multimeter (Ohm scale), you need to take the positive lead of the multimeter to test the negative black cable.
If debris is not the problem, use your multimeter to check for voltage in the contacts motor. The resistance (ohms) of the windings should be tested. If it’s a zero reading, then this indicates that your winding has a shortage. If it reads an infinity symbol, then it means the winding has an opening somewhere.
Next, move to its capacitor. The capacitor generates typically the torque needed by the motor. You are likely to find it connected to two brown wires running from the motor.
Make sure the unit power is turned off. Next, you discharge the capacitor before testing. The simplest way to test the capacitor is by use of a specialized-capacitor testing tool. If you are not equipped with it, then check the resistance by use of the multimeter. You need to connect a lead to each terminal. After this, you should notice the readings start from zero.
Just a random guy who likes to build things. Providing tool knowledge, appliance/device testing tips, and DIY project info in an easy-to read & non-intimidating style.