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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
Fan only works on highest speed. 2008 Volkswagen Passat
Hi there, thanks for writing in about your 2008 Volkswagen Passat. If the blower motor resistor and connector are good, then the only other thing that can cause the problem is the blower control switch or connector. Check the resistor...
Question
AC fan only works on high
This is a common problem when the A/C blower motor resistor goes out. This is an inexpensive part to replace and is found under the dash near the A/C blower motor. This resistor controls the speed of the blower fan....
Question
Air
Hello there, thank you for asking about your 2008 Ford Mustang. You will need to have the blower motor under the right side of the dash checked to see if it is getting power from the blower relay that is...
Question
My heat/ AC blower motor does not work, the blower is good, the resistor has been replaced, and the relay is good. What am I missing?
Hello. There is a service bulletin out relating to the blower motor of 2003 Suburbans: 11046. It pertains to the blower motor electrical issues Chevy experienced during that time. The electrical terminals were essentially melting. It is a fire hazard....
Question
where is my blower motor or blower resistor?
The blower motor and blower resistor is located in the right side of the dash under and behind the glove box.
Question
My blower switch only works on #2 speed & high speed could this be the blower resistor?
Hello there, a few common faults can cause your 1972 Oldsmobile Cutlass to only work on the #2 speed air flow. You are correct, the blower motor resistor could cause this fault. Other likely causes would be the fan control...
Question
My blower motor and interior lights quit working. How do I fix it?
Hello - first thing to check would be blown fuses. These 2 components are on separate circuits. The blower motor also has a relay which should be checked. If the fan works on the High/Max position, but not other speeds,...
Question
No heat,defrost or air coming from front a/c vents
Hello - there a couple of possibilities here for this problem: the blower motor resistor pack, or the fan switch portion of the HVAC control itself. The blower motor resistor pack regulates fan speed in the Low or Medium positions,...
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
The blower motor does not turn on and the blower resistor starts smoking
A seized blower motor can be the cause. If the motor is seized and is drawing too much current, it can damage or burn the resistor as well as other electrical components in the heating/air conditioning system. Have a certified...
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
The AC/heat blower fan - 1997 Dodge Avenger
Hey there. The most common failure where the fan only blows on high is the blower motor resistor. It is possible the blower motor switch is the culprit, and it can be replaced separate of the control module. Diagnosing...
Question
My AC is not turning on
Hi there. It sounds like the blower resister could be at fault. First, check the fuses for this part and replace as necessary. Then, using a digital volt/ohm meter, check for battery voltage being supplied to the resistor, and then...
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 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...

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