How do I know if my AC resistor is bad?

How do I know if my AC resistor is bad?

Usually a bad or failing blower motor resistor will produce a few symptoms that can alert the driver of a potential issue.

1. Blower motor stuck on one speed.
2. Blower motor does not work on certain settings.
3. No air from the vehicle’s vents.

Is a blower motor and a blower motor resistor the same thing?

The motor that runs the fan in the heating and air conditioning system in a car is called a blower motor. A blower motor resistor is a simple electric resistor. It’s used in cars where the blower motor has only 4 or 5 fixed speeds, as on the left side in this diagram.

Where is the heater blower resistor located?

The heater blower motor resistor is often found beneath the dashboard. It is located in the heater and air conditioning compartment. It’s connected to the air conditioning system, where it can adjust the speed of the blower motor fan. It can also be found behind the glove box of some vehicles.

What type of resistor is a blower motor resistor?

In newer applications, the blower motor resistor is actually a solid state module that sends a varied signal to the blower motor. The traditional blower motor resistor is connected to ground and wired in series with the blower motor assembly. Blower motor resistors have several resistors with different resistances.

Does a blower motor come with a resistor?

A blower motor resistor, typically located beneath the passenger side dashboard, contains three resistors, or sets of terminals designed to generate voltage in proportion to electrical current. These resistors allow the blower motor to function at lower speeds.

Why does my blower motor only work on high?

Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. And when one or more of these resistors burn out, you’re usually left with only one heater blower motor speed—high. The resistor module is easy and inexpensive to replace.

Where can I get a new blower motor resistor?

With over 1,000 blower motor resistors in stock, Autozone is ready to provide you with the blower you need, no matter what type of car or truck you drive. If you need a new blower motor resistor for your car or truck, shop with Autozone today to get a high quality replacement you can count on.

What happens when you heat a blower resistor?

Blower resistor terminals can develop resistance, and when they do, they get hot and begin to oxidize even further, creating large amounts of resistance where no resistance should be, heating the wire terminals and the wires feeding them until they scorch and melt the blower resistor connector.

How is the speed of the blower motor controlled?

On climate control systems without automatic temperature controls, the blower motor speeds are controlled by a switch wired to a stepped resistor that usually includes a thermal fuse.