What does an AC resistor do?
The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed. A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system.
Do air conditioners have resistors?
The heating and air-conditioning system uses several resistors to supply the desired airflow by sending power to the blower motor.
Why does my AC resistor keep going out?
Trent, one of the biggest reasons for blower motor resistors to have shorten life is actually because of faulty blower motor drawing too many amps, some times melting wires/plugs, heating up resistors shortening their life.
What is the function of a cooling fan resistor?
This is made possible by routing their power through the cooling fan resistor. The cooling fan resistor is an electrical resistor that limits power to the fan in steps, so that the fan can operate at different speeds according to the cooling system’s demands.
What are the symptoms of a bad cooling fan resistor?
Another symptom of a potential problem with the cooling fan resistor is cooling fans that stay on at all times. If the resistor shorts or fails, it can cause the cooling fans to stay on even when they are not supposed to.
How does the resistor on a blower motor work?
A blower resistor uses resistance to control the speed of the blower motor. In high speed, the resistor is bypassed and power is fed to the motor directly from the switch. This illustration shows a typical blower resistor, specifications and test procedures vary between different manufacturers.
Is the resistance of a resistor the same in AC and DC?
The resistance value of the resistor in both AC and DC circuits is same irrespective of the frequency of the AC supply voltage. The change in direction of current in AC supply does not affect resistors behavior.
What are the symptoms of a bad blower motor resistor?
Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. Blower motor does not work on certain settings. No air from the vehicle’s vents.
How much does it cost to replace a fan motor?
When your air conditioner’s fan motor breaks, it will typically cost about $300 to $600 to replace. It’s imperative to get this fixed quickly, since without a working fan motor your air conditioner’s compressor can be the next domino to tumble. Its repair is even more significant – usually running closer to $2,000 .
Where is the AC blower relay located?
The blower motor relay is located in a wire harness connector that is secured to the Heater-A/C housing behind the glove box on the passenger side of the vehicle, next to the Heater-A/C wire harness connector in the passenger compartment.
What is an AC resistor?
Resistor AC Response. For ordinary currents and frequencies the behavior of a resistor is that of a dissipative element which converts electrical energy into heat. It is independent of the direction of current flow and independent of the frequency. So we say that the AC impedance of a resistor is the same as its DC resistance.