How to tell if your blower motor resistor is bad

When fan speed is changed via the knob. It is usually controlled by the blower motor resistor and switch, and can operate at several different speeds to help regulate cabin temperatures. There are several symptoms that appear when the resistor of the blower motor is going bad.

How to Diagnose an AC Problem on your Car - Air Conditioning Diagnosis - Duration: 2:55. I checked the voltage going to the blower motor and it is at 14.

So my question is, if this kinda burned up the .

I can get electrical diagrams like you use in your videos thanks.

The individual resistors inside the pack are usually wire wound and they may fail by burning out from use, and may also fail due to mechanical stresses and vibrations typically found in an automotive environment. Blower motor resistor symptoms. I only works on high speed when the blower resistor circuit is bad.

Check this post, scroll down the page. How to notice bad resistor in Toyota blower or fan.

Location diagrams will also point out important parts in the climate control system such as relays, switches and fuses. If not, plug it back in and unplug the resistor block. Probe each hole and move the fan speed switch.

The blower motor may seem to be to blame when air flow becomes notably decrease when if fact, the fault lies elsewhere. Discrepancies in the electric circuit for the blower, such as bad control switches or resistors , can halt all function, or prevent operation at certain speed settings.

If you notice any part of the air and heating system behaving bizarrely, however, you should always schedule an inspection. Go to Continuity Test 2) Testing the Control Module output. Fan Switch Position - Voltage . I had this problem reoccurring!

To diagnose this, you may have to crack open the heater . So the normal perception that the fan works atleast at one speed if resistor is bad is not true.

But when the blower motor is not responding like it shoul and you know it is . Tell Us More About Your Chevrolet Tahoe. In this video we go over testing blower motor resistors found in Ford vehicles with manual climate control. Turns out the ignition switch was bad.

It was causing the blower motor to stay on even when the ignition was in the off position.

Buy online, pick up in-store in minutes. To confirm the resistor is the root problem on your V7 test it first. There have been cases where the final stage has kept the blower motor .