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Resistor

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Symptoms of a Bad or Failing Ballast Resistor
Common signs are the vehicle not starting or starting but immediately dying. Only a professional mechanic should handle the ballast resistor.
Symptoms of a Bad or Failing Cooling Fan Resistor
Common signs include the engine overheating, cooling fan only working at certain speeds, and the fan never turning off.
How Long Does a Ballast Resistor Last?
A ballast resistor is a component in the ignition system of older vehicles. If you drive a classic, you are familiar with coils and points. You don’t have an onboard computer, and...
How to Replace a Cooling Fan Resistor
The cooling fan may not work at all speeds if the resistor is broken. If the engine overheats or the fan never turns off, the resistor may be faulty.
How to Buy a Good Quality Heater Blower Motor Resistor
Vehicles that are equipped with a manual HVAC, or climate control, system utilize a blower motor resistor to control the speed of the heater blower. If you are driving a minivan or...

Related questions

Question
How do I know if it's my blower motor resistor or the resistor switch that's not working?
The referenced parts are tested with an ohmmeter. The resistor block must have a specified resistance across each element on the block. However, if any resistors are open (infinite resistance), the block is just condemned and replaced automatically. Occasionally, you...
Question
HVAC Blower Motor Fan runs on high Speed all the time
This may be related to a faulty blower motor control module or resistor. The blower motor resistor controls the various speeds and functions of the blower motor once it is turned on. I would recommend having an expert from YourMechanic...
Question
Delay lights stop working in the cab.
Hi there. Check the resister to the interior lighting of the vehicle. The resister will stay engaged for a while to keep the interior lights on. If the resister has failed, the lights will just shut off. They still may...
Question
Heater/ac blower resistor
This may be either the resistor or the wiring connection to the resistor. i would recommend first eliminating or confirming the resistor as the problem since this is much easier to test than faulty wiring. Many blower resistors control current...
Question
Heater problems
The most common symptom of a failed blower motor resistor is when the fan works in "High" speed, but doesn't work in some lower speeds. The highest speed setting may still work because in most cars in the highest fan...
Question
Burnt yellow and brown wires at blower motor resistor, is this indicator of bad resistor or bad motor? 2011 Chevrolet Malibu
Hi there - most likely, the problem is the blower motor resistor pack. A quick way to test this is if the blower fan still works in the "Max" position. If it does, that pretty-much rules out the motor as...
Question
Heater only works on high
It sounds like you may have a faulty blower motor potentially drawing too much power from the resistor causing it to burn itself up. As you know, the individual blower motor resistor inside the pack are usually wire wound and...
Question
Heater
Hi There, This is a sign of a faulty blower motor resistor. Blower motor 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...
Question
Why does my front blower motor not work on my 2013 Toyota Highlander
Hello. If the blower motor is not working it is typically caused by an issue with the resistor, though it can be the motor itself. I usually check to see if the motor is getting power. If it is getting...
Question
Heat in the front won't work
Hi there. The front heater core my be restricted. A cooling system flush may resolve the problem. It may be a faulty temperature blend door actuator if the blower motor is still not operational. Checking the fuse would be in...
Question
No heat, no sound, no nothing
Hi. An electrical diagnostic by a certified professional would determine if the blower motor, resistor, relay, wiring, and switch are operational. It is not unusual for the resistor block to go bad and certainly that can be looked at first....
Question
My blower motor is not working on 2008 Hyundai Sante Fe
Hello, thanks for writing in. The blower motor resistor is what controls the different modes (i.e. high speed, low speed, etc.) of the motor. The blower motor relay is what controls the power to the motor in general. I would...
Question
Is a transistor and a blower motor resistor the same thing?
When you were told to replace the resistor or the transistor the person that told you did not know if you had manual or automatic a/c. Your car will have a blower resistor for manual a/c blower controls and a...
Question
Blower Fan Run Very Slow At All Speed Selections
The speed of the fan blowing is generally controlled by the resistor which you have already replaced. Occasionally, the blower motor itself can fail also causing this type of problem, however it sounds like you have replaced this also. The...
Question
Blower motor resistor and transistor.
Your car is not equipped with a transistor for the blower motor. Your car has a blower resistor that controls the speed of the blower motor with the changes to the blower switch. The burning smell you are getting may...
Question
Blower motor not working
If your heater only blows when the setting is on high, this may suggest that you have a faulty blower motor resistor. The highest speed setting may still work because in most cars in the highest fan speed settings the...
Question
Air not flowing out of front vents.
If the blower motor is not turning, the cause is identified during a failed heater diagnostic. Blower motors failures are due to faults in the wiring, fuse, relay, control switch, resistor block, if so equipped, and of course the blower...
Question
The heat, ac, and defrost isn't blowing out the vents
Blower speed in your application is controlled by a replaceable resistor block in the blower motor circuit. If various fan speeds have become unusable, and now you are left with nothing, a possibility is all positions in this resistor block...
Question
2007 galant es blower motor resistor or transistor
Your vehicle is equipped with a blower motor resistor block. It is a modular, replaceable assembly and the part is different for Galants with and without A/C systems. If your blower motor is not functioning, failure of the resistor block...
Question
Fans working on 4th setting only
Blower speed in your application is controlled by a replaceable resistor block in the blower motor circuit. If various blower fan speeds have become unusable, and you are now left with only one speed, a common cause is the resistor...

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