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.
How do you tell if it’s the blower motor or resistor is bad?
Symptoms of a Bad or Failing Heater 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 can you tell if a blower fuse is blown?
Use voltmeter or ohmmeter to check for a blown fuse. If you find one, replace it. Start car and see if blower motor works. If fuse blows again, check for loose circuits.
What happens when blower motor stops working?
Typically, blower motors have a very long life. … One sign of a faulty blower motor is an air conditioner that still runs without blowing cool air. Remember: If the blower motor stops working, air is not moving through the system. This means the evaporator coil might freeze up, or it could cause damage to the compressor.
What happens when blower motor relay goes bad?
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.
Is there a fuse for the blower motor?
Many vehicles have two fuses for the blower motor, one in the interior fuse block and the other under the hood. The blower motor is usually under the dashboard on the passenger side.
How do I reset my blower motor?
How to Find and Reset your Furnace Motor Blower
- Step 1: Turn off the power to the furnace. …
- Step 2: Remove the blower compartment cover. …
- Step 3: Make sure the blower is completely cooled off. …
- Step 4: Locate the reset button. …
- Step 5: Press the button in (assuming that this is your issue and that the button has popped).
How do you test a blower motor switch?
Test the switch. Plug the connector back in to the blower motor, and then trace the wire harness back to the connector closest to the blower motor switch, usually located under the dash. Disconnect the connector and set the multimeter to ohms.
Where is the blower fuse located?
If power is missing, check the blower motor relay (see below).
Where is the blower motor fuse and relay?
The blower relay is located near the front of the fuse block and is labeled “Blower.” Inspect the center of the relay. If the metal rod inside is broken, the relay will need to be replaced.
Where is the relay for the blower motor?
The blower motor relay is generally located in the under-hood fuse box or in the under-dash fuse box. A blown fuse can mimic relay failure.
How do I know if I need a new blower motor?
What Are Signs Your Blower Motor Needs to Be Replaced?
- Poor or Airflow from Air Vents. This will be the first and most obvious sign your blower motor has a problem. …
- No Airflow At All From Vents. …
- Skyrocketing Energy Bills. …
- Strange Noises When You Turn on the Heat. …
- Overheating Blower / Weird Smells.
How much does a blower resistor cost?
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.