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Why does my blower fan only work on high?
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.
How do I know if my fan speed switch is bad?
Here are some of the warning signs of a bad heater blower motor resistor:
- Fan does not work at all, so no air comes out of the vents.
- Fan only works on some speeds and not others.
- Fan only works on the highest speed.
- Fan runs all the time and can’t be controlled with the fan switch.
- You see smoke coming out of the vents.
Does blower motor resistor affect AC?
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. A failed blower motor resistor can cause issues with the operation of the entire heating and air conditioning system.
Can you fix a blower motor resistor?
The resistor module is easy and inexpensive to replace. It’s then typically installed in the ductwork, near the car blower—either under the dash or under the hood. (Refer to a service manual to locate yours.) Purchase a new resistor module at the auto parts store (usually less than $25).
How do you fix a fan that stops working?
Floor Fan Stopped Working? Your Troubleshooting Guide
- Check the Cord. It sounds simple, but your first step should be to make sure the cord is securely plugged in.
- Check Your Circuit Breaker.
- Check for Power to Your Outlet.
- Check the Fan Fuse.
- Replace the Cord.
- Clean the Fan.
- Grease the Motor.
- Call Customer Support.
What happens if 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.