What does a blower fan resistor do?
Blower resistors are resistors which are used to control the fan speed of automotive blowers. The fan speed can be changed either by switching the blower resistor resistance mechanically using a rotating lever, or electronically by the air conditioning system.
How do you know if a fan resistor is bad?
What are the symptoms of a bad blower motor resistor?
- No Air.
- High speeds only.
- Low speed only.
- Fan won’t turn off.
- Blower motor works on some settings but not others.
- Smoking vents.
- Burning smell.
How does a cooling fan resistor work?
The resistor is powered by the ignition and enables the cooling fan to run at slow speed. Once the engine reaches a manufacturer-predetermined temperature, a temperature switch indicates to the cooling fan resistor that the fan should run at high speed to draw more air through the radiator and provide extra cooling.
How do you test a fan resistor?
Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.
How to notice bad resistor in Toyota blower or fan?
How to notice bad resistor in Toyota blower or fan. Issues in fan or blower speeds. – YouTube If playback doesn’t begin shortly, try restarting your device.
What happens when a blower motor resistor fails?
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.
What are the symptoms of a bad heater motor resistor?
Symptoms of a Bad or Failing Heater Blower Motor Resistor 1 Blower motor stuck on one speed A common symptom of a faulty blower motor resistor is a blower motor that is stuck on… 2 Blower motor does not work on certain settings Another common symptom of a faulty blower motor resistor is a a blower… 3 No air from the vehicle’s vents More