How do you know if it’s the blower motor or resistor?
The most common symptom of a bad blower motor resistor is the blower motor will only work at one or two speeds. It can also cause the blower motor to stop working completely and you will notice no air coming from the vents.
Why does my blower motor 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.
Why does my blower motor work sometimes?
When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds so the fan runs slower.
Why does my blower motor resistor keep burning out?
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.
Can you fix a blower motor resistor?
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.
How do I know if my furnace blower motor is bad?
Signs of an Overheating Blower Motor
- A “hot” or burning smell from vents in the home. This symptom is often coupled with the furnace shutting off completely. …
- Loud humming and other unusual noises. We have many homeowners call us mentioning humming and other odd sounds. …
- Furnace cycles off and refuses to restart.
What are the signs of a bad blower motor?
Here are 4 common symptoms of a bad blower motor:
- Low/no airflow from vents. The classic sign of a bad blower motor is restricted airflow coming from your air vents. …
- Strange sounds coming from blower. …
- Circuit breaker keeps tripping. …
- Hot/burning smell coming from air vents.
Why does my blower motor only work on low?
When a blower resistor fails, the highest fan speed usually is the only one that still works because it essentially bypasses the resistor and receives the maximum amount of voltage. When the resistor is working, it reduces the amount of voltage going to the lower fan speeds, so the fan runs slower.
What causes blower motor failure?
What Causes Blower Motor Failure? Like other components in your HVAC system, the blower motor can wear down over time. Some of the reasons a blower motor might fail are overheating, and excessive moisture. When dust, dirt, and debris build up, it can cause the windings and bearings to burn up more quickly.
Why does my air conditioning run at only one speed?
When the resistor fails, typically, the highest setting is the only option that still functions. This is because the air from the blower motor is bypassing the resistor, thus gaining the maximum amount of voltage, resulting in full power. In other cases, there could be an issue with your AC module or the fan switch.
Can a blower motor resistor be intermittent?
The higher current can make the jump across the resistor contacts that are going bad and get the blower motor to engage. The blower motor could stop working again on longer roadtrips when the car is at a cruising speed and the electrical current of the motor drops again.
Can a resistor be intermittent?
Resistors can fail open or short, alongside their value changing under environmental conditions and outside performance limits. Examples of resistor failures include: Manufacturing defects causing intermittent problems.
How much does it cost to replace a blower motor?
Replacing a blower motor costs $450 on average with a typical range of $250 to $800. With a warranty, you might pay as little as $150 for labor alone. For high-end models, like those with large motors or access issues, you might pay as much as $2,000.