The blower motor resistor is designed to last for the car’s lifespan. In most cases, these resistors will wear out long before the car does. Usually, the wear that the blower motor resistor has is due to the constant use that it gets and the heat that it is exposed on a regular basis.
How do you know if you need a new blower motor or resistor?
Typically, if the fan will work on some speeds but not on others, the resistor is suspect. Okay, let’s say there’s no melting going on, but your fan doesn’t work on all speeds. Typically, if the fan will work on some speeds but not on others, the resistor is suspect.
How do you know if a blower motor resistor is bad?
The most common symptom of a failed blower motor resistor is when the heater fan only runs at the highest speed setting (4 or 5) and doesn’t work at low speeds. In some cars, a failed blower motor resistor can cause a heater fan to stop working completely.
What happens when a blower motor resistor fails?
If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.
What are the symptoms of a bad blower motor?
SIGNS OF A BAD BLOWER MOTOR
- FAN BLOWS AT ONLY A CERTAIN SPEED. …
- WEAK AIRFLOW OF THE BLOWER MOTOR. …
- UNUSUAL NOISES FROM HVAC SYSTEM. …
- SMOKE OR SMELL WHEN DRIVING. …
- HOW DOES A CAR BLOWER MOTOR WORK?
Why does my blower motor resistor keeps melting?
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.
Why does my blower only work on high?
Most car manufacturers use a series of resistors to make the heater blower motor run at different speeds. And when one or more of these resistors burn out, you’re usually left with only one heater blower motor speed—high. The resistor module is easy and inexpensive to replace.
Is there a way to test a blower motor resistor?
Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.
Can a blower motor resistor be repaired?
The average cost to replace the blower motor resistor at a repair shop is between $44 and $55 in parts and $70 in labor costs, for a total cost of around $114 to $125. On the other hand, you can easily fix the blower motor resistor at home in about an hour (even if you’re a beginner) and for around $70.
Why does my blower motor fuse keep blowing?
If the blower motor relay develops any sort of problem that hinders its ability to properly limit and distribute power, it may cause the blower motor fuse to blow. Any sort of electrical spikes or excessive current from a bad relay will blow the fuse and cut power in order to protect the system.
How much does it cost to fix a blower motor resistor?
The average cost for blower motor resistor replacement is between $109 and $140. Labor costs are estimated between $44 and $55 while parts are priced between $65 and $84. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location. Related repairs may also be needed.
Can a blower motor resistor work intermittently?
This often presents itself as the blower fan not kicking on until the engine is producing a certain level of electric current. The higher current can make the jump across the resistor contacts that are going bad and get the blower motor to engage.
Do blower motors get weak?
Weak airflow is a sign of blower motor failure. This part wears out eventually, meaning its fans can no longer push adequate amount of air out the vents or through window defrosters.
How long should a car blower motor last?
The bearings of the blower motor can also lose their initial lubrication and begin to dry out, causing increased friction in the motor. The blower motor in your home or office should last anywhere from 10 to 20 years. Modern sealed bearings and sealed bushings can push the lifespan to its maximum of 20 years.