What does a heater blower motor resistor do?

What does a heater blower motor resistor do?

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. The blower motor resistor is constantly put under stress which can cause it to eventually fail.

Why do blower motor resistors fail?

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.

How do you know if your climate control switch is bad?

Symptoms of a Bad or Failing AC Control Switch

  1. Overheating AC parts. One of the first signs that the AC control switch may be having a problem is that certain parts of the AC may overheat.
  2. Certain settings not working or working intermittently.
  3. AC compressor not coming on.

What are the symptoms of a bad heater motor resistor?

Symptoms of a Bad or Failing Heater Blower Motor Resistor Common signs include the car’s heater not working or getting stuck on a certain speed, or something getting jammed in the blower motor. by Eduardo Ruelas on January 08, 2016 1.

What does the resistor on a heater do?

It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

Can a bad heater fan cause a bad blower resistor?

The heater blower motor resistor can often go bad because of a bad heater fan, and therefore you often have to replace both the heater blower resistor and the fan. It’s also not a difficult part to replace. It might take you more time to diagnose the problem versus replacing the resistor.

What happens when the resistor on a air conditioner fails?

Because the blower motor resistor adjusts the fan speed, the inability to change it can point to problems. If the resistor fails or shorts, the blower motor might remain stuck at a particular speed. While you could still use the air conditioning or heater at his speed, you will want to repair it for complete functionality again.

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