What controls the blower motor speed?
blower motor resistor
The blower motor resistor is responsible for controlling the blower motor speed. In the past, this was done by varying the voltage supplied to the blower motor. In newer applications, the blower motor resistor is actually a solid state module that sends a varied signal to the blower motor.
How does a fan speed control work?
Fan speed is reduced by placing a capacitor in series with the switched live feed to the fan reduce power. The capacitor acts as a dropper. Speed depends on the value of the capacitor in circuit. The speed control switch selects a different capacitor to give different speeds.
What does a blower motor control module do?
A blower motor resistor or a blower motor control module is the part that controls the speed of the blower motor.
When the blower control is set on high the blower motor receives full battery voltage?
When the blower is on high, it’s getting full battery voltage so it can run at full speed. If you select some other speed, the current flows through a resistor or transistor assembly that takes away some of the feed voltage. If the blower receives less voltage, it will run slower.
How do I adjust the fan speed on my ECM motor?
For an ECM blower motor with wires exiting the module (shown above), the speed is changed at the control board by moving the colored wire terminals. Only 3 of the 5 colored wires may be used at a time. These three are connected to the “Cool”, “Heat”, and “Fan” terminals on the control board.
Is higher fan speed better?
In general, the slower the air speed, the better the cooling since the air spends more time on the evaporator. The tendency is to use the highest speed, to get a higher volume, but that will result in a less colder air.
Can I use a dimmer switch to control fan speed?
Standard dimmer switches should never be used to control the fan motor on a ceiling fan because the dimmer could damage the fan motor, or overheat and start a fire. You can actually purchase a device that will do this – it consists of a wireless remote and a receiver that gets wired directly in to the fan.
How to access blower motor?
– What is a furnace blower motor? – Supplies you’ll need to check your furnace blower motor – How to locate the blower motor in your furnace – How to check the blower motor (with and without a voltage meter)
Why does blower motor works intermittently?
When the resister of the blower motor starts to fail, the motor operates only intermittently. The higher current can make the jump across the resistor contacts that are going bad and get the blower motor to engage. Why does the blower in my car only work on high?
How to check the blower motor?
Disconnect car battery.
How do you change blower motor?
– Insert the blower motor into its slot – Align the tab and turn the blower motor clockwise – Line up the blower motor and replace the three 7mm bolts – Replace the ground screw with the Phillips bit – Replace the blower motor cover – Reconnect the resistor harnesses – Insert the hooks on the glove box onto the bars and push it into place