Why does my blower motor work sometimes?
When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds so the fan runs slower.
Why AC blower stops working after a while?
One of the most common reasons fans stop spinning is because of a dead capacitor. The AC’s capacitors are small, cylinder components that send energy signals to power the fan motor and the rest of the AC unit.
Why does my AC blower keep turning on and off?
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.
Why does my AC blower keep going out?
Weak Airflow from the Vents
There are a number of possible reasons why this is happening, including dirt and dust buildup, bad capacitor, and an aging motor. If your blower motor is dirty or has a bad capacitor, you can call in an HVAC technician to fix the problem.
How do I know if I have a bad blower motor relay?
Blower motor relays tend to wear out over time from the stress of constantly flicking back-and-forth. These signs indicate a possible issue with the blower motor relay. When the blower motor does not respond at all, it may not be due to mechanical failure within the motor itself.
How do you tell if it’s the blower motor or resistor is bad?
A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.
Can AC capacitor work intermittently?
The capacitor may intermittently fail at its job as it is going bad, leading to occasions when the air conditioner is unable to do its job.
What happens if blower motor relay goes bad?
If you have a faulty blower motor, you may experience low airflow from the vents, even when the fan is on high. There will be no air coming from the vents if your fan isn’t working due to a bad blower motor resistor. Blown relay circuit fuses or melted relays are more serious signs of a bad blower motor relay.
How do I test my AC blower relay?
Quote from the video:
Quote from Youtube video: Set your meter to the lowest resistance level. And you should read approximately 70 80 ohms of resistance. We're showing 79 it's good now between the other side five and six should show closed two.
How much does it cost to replace a blower motor relay?
around $50 to $80
The blower motor is operated by an electrically operated switch, called a relay. If the relay fails, the motor’s fans will not blow conditioned air into your car. Fixing the relay usually costs around $50 to $80.
What relay controls the blower motor?
The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching.
How much does it cost to replace a blower motor on an AC unit?
Home AC Blower Motor Replacement Cost
Replacing the blower motor in an AC unit costs the same as a furnace since they share this mechanism. Expect to pay $250 to $800 on average. You might spend up to $2,000 depending on the brand.
Where is the blower motor fuse located?
Quote from the video:
Quote from Youtube video: The blower motor fuse is located in a small fuse box just next to the passenger.
Is there a fuse that controls the blower motor?
Fuse Protection
To protect the blower motor power circuit, a 20-, 25- or 30-amp fuse is usually located in the fuse panel under the dash. The rating of the fuse will depend on the vehicle application and how much power the blower motor requires at full speed.
How do I reset my AC blower?
Locate the reset button on the furnace and press it to reset the furnace. It is usually located inside the blower compartment on the side of the blower motor. Be cautious as the housing may be hot. If the button is popped up, press it down.
