Why does my blower resistor keep going bad?

Trent, one of the biggest reasons for blower motor resistors to have shorten life is actually because of faulty blower motor drawing too many amps, some times melting wires/plugs, heating up resistors shortening their life. Many Dodge forums tell of this problem.

What should the voltage be on a blower motor?

If those are OK than backprobe the blower motor connector and check for power on terminal 1. Check terminal 2 for a variable voltage, this should be 12v with the fan control knob on off and 5v or full ground on full. If that checks out replace the blower motor.

Where are the fuses on a blower motor?

Check fuses 10 & 11 in the underdash fusebox. If those are OK than backprobe the blower motor connector and check for power on terminal 1. Check terminal 2 for a variable voltage, this should be 12v with the fan control knob on off and 5v or full ground on full.

When do you replace the fan control AMP?

If that checks out replace the blower motor. If you don’t see a change in voltage on terminal 2 of the blower motor when adjusting the fan control knob than check for power on terminal 2 of the fan control amp and for ground on terminal 1. If you have power and ground replace the fan control amp.

What are the symptoms of a bad blower motor resistor?

Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. Blower motor does not work on certain settings. No air from the vehicle’s vents.

How much does it cost to replace a blower motor?

Motor type. Standard blower motors operate at a single speed and cost around $450 to replace, including parts and labor. Variable-speed motors cost $600 and up to replace.

How much does an AC blower motor cost?

The costs to replace the furnace blower motor will depend on a few factors, including the type of blower motor required, the contractor you decide to hire and your geographical region. Based on these factors, the costs, including both parts and labor, can range anywhere from $250 to more than $500 for a standard single speed blower motor.

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.

Why does my Dodge Dakota blower keep going bad?

If you leave the blower motor switched continually on you may not notice this. If so I suspect that there is an earth fault on one of the wires connected to either pin 4 or 5 of the resistor. Here is a the blower circuit for a 2002 Dodge Dakota. Hopefully it is the same for your particular year model.

Where does the power go in a blower motor?

For each higher speed, power flows through one less resistor. Some car makers run blower motor power through the fan speed switch first, then through the blower motor resistor and then to the blower motor and ground. Other car makers reverse that and run power to the blower motor first and terminate ground at the blower fan speed switch.

How to test Honda Accord blower motor resistor?

Testing Honda power transistor (blower motor control module). For example, in the 2009 Honda Accord, the service manual describes the procedure as follows: Turn the ignition to ON. Press and hold the OFF button and within 10 seconds press and release the Window Defogger button five times.

Where is the blower motor resistor located on a car?

It’s located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.

What are the symptoms of a bad heater motor resistor?

Symptoms of a Bad or Failing Heater Blower Motor Resistor. 1 1. Blower motor stuck on one speed. A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower 2 2. Blower motor does not work on certain settings. 3 3. No air from the vehicle’s vents.

What does the blower motor resistor do in a car?

The blower motor resistor is an electrical component that is a part of the vehicle’s heating and air conditioning system. It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

Why is my blower motor stuck on one speed?

Blower motor stuck on one speed A common symptom of a faulty blower motor resistor is a blower motor that is stuck on one setting. The blower motor resistor is the component directly responsible for controlling the blower motor fan speed. If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed.

Why is my Dodge Caravan blower not working?

If your car heater isn’t working it might be the resistor. This video shows the removal and replacement of a Dodge/Chrysler Caravan/Town & Country blower motor resistor. The van worked on is a 2001 Dodge Caravan but most vans/cars/trucks are the a lot alike. If this video helps with your repair then please leave a comment.

When did I replace the heater blower resistor?

Back in October 2015 I replaced the heater blower resistor (provides the different fan speeds) of a family member using genuine Mercedes replacement part. Today I’ve had to replace the same part again.

How does a blower motor resistor work in a car?

This is done, so the resistor or a control module is cooled down by passing air. In some older cars, a blower motor resistor was installed on the firewall with the access from under the hood. Problems with a blower motor resistor are common in many cars.

Why are my heater resistors getting hotter?

If the lubrication in the motor bearings has given up the ghost then the resistors will be getting much hotter, both from increased current draw and lower airflow over them. Those are interesting points, and I’d wondered along similar lines too.

What does the resistor on a heater do?

It is responsible for controlling the blower motor’s fan speed. When fan speed is changed via the knob on the instrument cluster, the blower motor resistor changes setting, which changes the speed of the blower motor.

Why does my blower resistor keep going bad?