Table of Contents
What does the blower fuse do?
The blower motor pushes the warm or cold air through your vehicle’s ventilation system. The blower motor is powered by a fuse-like device called a relay. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown.
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. Remove the screws, and swap out the resistor module.
What does it mean when a fuse is blown?
Yet people commonly use the expression “blown fuse” to describe just about any unexpected electricity-related occurrence, especially one involving a loss of power. A “blown fuse” can mean many different things–several of which have little to do with actual fuses.
How does the speed of the blower motor work?
In most modern cars, the speed of the blower motor can be adjusted gradually. The electronic module that controls the speed of the blower motor is called a blower motor control module. In some cars, the blower motor has only 4 or 5 fixed speeds. In this case, the speed of the blower motor is controlled by a blower motor resistor.
What are the symptoms of a failed blower motor resistor?
Blower motor resistor / control module problems. Problems with a blower motor resistor are common in many cars. 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.
Where is the blower motor located in a car?
The motor that runs the fan in the heating and air conditioning system in a car is called a blower motor. It’s located inside the dash, often on the opposite side of the steering wheel or inside the engine compartment on the firewall. A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.