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 causes a blower motor resistor to burn out?
In most cases, a blower motor resistor fails due to corrosion or overheating. Sometimes, the mechanical resistance to the motor rotation causes an excessive electric current that can overheat and prematurely damage the blower motor resistor.
Can you bypass the blower motor resistor?
In the highest speed state, the blower resistor is bypassed completely and the fan is connected directly to the car’s battery, which allows maximum current through the motor. Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor.
Are blower motor resistors supposed to get hot?
Yes that resistor will get very hot. Most people don`t know this but it is faster to defrost the windshield on low or medium fan speed due to that resistor putting off heat. Also that resistor needs to be cooled off with the air flow or it will burn up .
What happens when blower resistor goes bad?
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 signs of a bad blower motor relay?
If you have a faulty blower motor, you may experience low airflow from the vents, even when the fan is on high. There will be no air coming from the vents if your fan isn’t working due to a bad blower motor resistor.
How do I know if my blower motor resistor is bad?
What are the symptoms of a bad blower motor resistor?
- No Air. …
- High speeds only. …
- Low speed only. …
- Fan won’t turn off. …
- Blower motor works on some settings but not others. …
- Smoking vents. …
- Burning smell.
Why is my blower motor not working?
The most common reason why your blower motor won’t work on any speed is that you have a bad or blown a fuse. … You want to make sure to check the blower motor fuse and also the HVAC controller fuse because either one of these being blown can cause the blower motor to stop working.
How much does it cost to replace a blower motor resistor?
The average cost for blower motor resistor replacement is between $108 and $137. Labor costs are estimated between $44 and $55 while parts are priced between $64 and $82. 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.