How do I know if my blower motor resistor is bad?
Symptoms of a bad heater blower motor resistor
- Fan does not work at all, so no air comes out of the vents.
- Fan only works on some speeds and not others.
- Fan only works on the highest speed.
- Fan runs all the time and can’t be controlled with the fan switch.
- You see smoke coming out of the vents.
How do you test a blower motor resistor?
Blower Motor Resistor Testing 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.
How much resistance should a blower motor resistor have?
According to the service manual, it must be around 4-5 ohms. In our case the ohmmeter shows open circuit, which means the resistor has failed. Sometimes, a blower motor resistor might fail due to problems with the blower motor itself.
What happens when blower resistor goes bad?
If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.
What happens when blower motor resistor goes bad?
Could You Tell Me the location of the blower motor resistor?
Find the blower resistor and detach it from the rest of the circuit. For the precise location, consult the repair manual for your car’s make and model. Some common locations are near the blower fan motor, under or behind the dashboard, around the passenger footwell etc.
Where exactly is the blower motor resistor?
Usually it’s located in the dashboard on the opposite side of the steering wheel. You can’t see it because it’s inside the vehicle, but that’s where it is located. The blower motor resistor is the part of the blower motor that controls the speed.
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.