Hi there, thanks for writing in. If this comes on right when the car is turned on, then most of the time it is caused by a bad blower resistor module. This module fails internally and causes this to occur. I usually test the module first to see if it has failed as it can also be the fan control from the HVAC module. If you want to have this blower motor problem fixed, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.
How to Identify and Fix Common car Problems ?
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The blower motor controls the airflow for the heating and cooling system; it is one of the main components for the HVAC system to operate properly.
In most cases, a blower motor resistor fails due to corrosion or overheating. Sometimes, the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor.
Since it directly contributes to airflow, a bad blower motor resistor will affect your HVAC system`s ability to both heat up AND cool down. If your fan seems to work properly, the speed settings function, and air is moving fine, but it`s just not getting cold, then you may have a bad heater core.
The fan setting on your thermostat controls your HVAC`s system blower. The blower helps circulate hot or cold air throughout your home until the temperature on the thermostat is reached. There are two settings on your thermostat to control the fan – auto or on.
Lack of maintenance: This is probably the most common reason that causes condenser fan motors to overheat and shut off. Proper and regular lubrication of the fan motor is necessary for the motor to run smoothly. Periodically making sure that there`s no debris or dust in or around the fan motor is also a good idea.
You may have a dirty air filter problem. When the air filter restricts airflow, the evaporator coil can become frozen, causing the unit to turn on and off. As a reminder, air filters should be replaced at least once a month. You may do this more often if you are constantly running your air in the summer.
Here`s an easy way to test if the fan`s capacitor is bad.
If the fan takes off and then keeps going on its own, you more than likely have a bad start capacitor. You took over its job of kick-starting the fan by pushing the blades. If the fan doesn`t start running, you may have a bad fan motor.
If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.
One of the first symptoms of a problem with the blower motor relay is a blower motor that does not function. As the relay is the switch that supplies current to the blower motor, if it fails internally, then power may be cut off from the blower motor circuit causing the motor to no longer function.
The blower motor resistor is responsible for controlling the blower motor speed. In the past, this was done by varying the voltage supplied to the blower motor. In newer applications, the blower motor resistor is actually a solid state module that sends a varied signal to the blower motor.
The blower motor resistor in your car is the part that is responsible for pushing air through the vents when using the air conditioner or heater.
If little air is coming through the vents (hot or cold), then it could be because the blower motor for the fan or a switch or resistor that controls fan speed isn`t working. Another cause might be that the electronically controlled “blend doors” that direct air flow are stuck or broken.
The fan speed can be changed by switching the blower resistor resistance mechanically, using a rotating lever, or electronically by the air conditioning system. The blower motor resistor is responsible for controlling the blower motor speed.
The green wire underneath your thermostat connects to the fan of your furnace or air handler. It terminates at the air handler or furnace. The green wire connects to terminal G on your thermostat.
The blower motor is an important part of your vehicle`s heat and air conditioning systems. Without it, you can`t control the temperature of your cabin — not a dire consequence, but definitely a major annoyance in extreme heat or cold.
What is a blower motor? This is the part in your air conditioning system that controls the operation of your AC system and regulates the temperature in your vehicle.
Your AC is rendered useless without a functioning fan or furnace blower motor. This could also mean that you need a furnace repair or should start looking at costs for blower motor replacement. In addition, you will either suffer from no air or weak airflow with fan problems.
The blower motor is a component in your HVAC system that blows the conditioned air through the vents in your home. It takes the cool air that your air conditioner makes and circulates it throughout your house. The blower circulates the air to ensure that the temperature reaches the level dictated by your thermostat.