Why do I need a new blower motor resistor?

When the power has to go through a higher resistance, it will reduce the voltage going to the blower motor; slowing the blower fan down. The newer style of blower resistor uses electronics to send small pulses to the blower motor and based on how frequent the pulses are can speed up and slow down the blower fan.

Can a broken motor switch stop a blower?

A broken blower motor switch can also stop the blower from changing to certain speed settings. If your blower motor cannot change to certain speeds, check both the resistor and the switch on your dashboard. The most common failure points are the resistor and the motor itself.

What should the voltage be on a blower motor?

If those are OK than backprobe the blower motor connector and check for power on terminal 1. Check terminal 2 for a variable voltage, this should be 12v with the fan control knob on off and 5v or full ground on full. If that checks out replace the blower motor.

How much does it cost to replace a blower motor?

See: how to check a fuse in a car. If a blower motor is bad, it will need to be replaced. The blower motor replacement costs from $320 to $650, depending on the car. In many cars it’s fairly easy; the blower motor is located behind the glove box and held by 3-4 screws.

Why does blower motor resistor keep going out?

The blower motor appears to be defective here. When the brushes wear out the motor draws excessive amps which could cause the resistor to burn out. Before making further replacements remove the motor and check it, especially the brush assembly. This is the most likely reason for the resistor to fail repetitively.

How much does a blower motor cost?

Based on these factors, the costs, including both parts and labor, can range anywhere from $250 to more than $500 for a standard single speed blower motor. If a blower motor is required for a more expensive unit, such as a variable-speed motor, then the costs could be more than $1,000; however, these motors tend to be relatively rare.

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.

What makes up a blend door actuator motor?

A blend door actuator is made up of an electric motor that turns a plastic gear set in one direction or another which is connected to an air control door pivot at the final drive of the unit.

When do I need to replace my blower motor?

However, a weak blower motor can place an excess load on the controller. If there are any signs of a failing blower motor (such as noisy operation or a slow turning blower), it should be replaced as soon as possible to prevent burning out the speed controller by drawing excess current through it.

How can I tell if my blend door actuator is bad?

To test the blend door operation and too double check that you are changing the correct actuator motor turn the blower motor on and work the door in each way. You will be able to feel the air change temperature or vent level. Compare the bad actuator to the new unit.

A blend door actuator is made up of an electric motor that turns a plastic gear set in one direction or another which is connected to an air control door pivot at the final drive of the unit.

What do I need to replace car door actuator?

You will need a tool set including an 5.5 mm socket for Chevy, GMC, Cadillac, Ford and Lincoln vehicles. Using a small socket and ratchet remove the mounting bolts that hold the under dash plastic cover on the passenger side. These screws can be in obscure places so look around for them.

Why do I need a new blower motor resistor?