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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

Air conditioning only blowing cold on one speed
From what I see, it seems that your Jeep is having issues with the part known as the blower motor. Unfortunately though with the limited information provided, it is difficult to diagnose whether your blower motor’s status remained the same...
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...
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....
A.c. running when engine is off.
The blower resistor is shorted and causing the blower to stay on. The resistor is in the blower housing. You will want to have the resistor replaced with a new one in order to remedy this problem.
Air conditioner
When you wiggle the green wire, it allows power to get to the blower motor. You should disconnect the connector for the resistor and blower motor and check the connector for signs of overheating, rust, or corrosion. Repair or...
A.c. not turning on at all
The blower control blend door actuator on the evaporator case may be bad. Have the blend door actuator removed to see if the blend door can be turned by hand. Sometimes, the actuator breaks and other times, the blend door...
How to change blower resistor
Remove the sound insulation panel located under the right side of the dash, by passenger's footing area. Disconnect connector to blower resistor next to blower motor and remove the two screws. From there you'll be able to remove resistor from...
blower for heat and air
This is caused by a shorted blower resistor. Replace the resistor and it should fix the problem you're having. The resistor is next to the blower motor, located under right side of the dash. If you need some help with...
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...
Heater/air won't turn on
Try checking the relay. Sometimes when the relay is not getting a good connection this can happen. I would also check all of the fuses. Sometimes when they have too heavy of a load they will blow which will in...
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....
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.
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...

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