The user chooses a suitable fan speed by using a selector to connect one of the resistors in the blower resistor pack.
Heater blower fan control motor resistor.
Your vehicle s blower motor resistor controls the speed of your blower motor.
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The blower motor resistor usually sits outside either the heater box or the hvac plenum that distributes air in the interior space.
Since the blower motor and resistor are working almost constantly it can wear out over time.
Easy quick video tutorial on how to replace blower resistor and motor with no tools and in just 10 minutes.
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It is responsible for controlling the blower motor s fan speed.
If you have faulty blower motor resist.
As the fan speed is one of the most frequently adjusted settings of the air conditioning system the blower motor resistor is put under constant stress which can cause it to eventually fail.
The blower motor resistor is an electrical component that is a part of the vehicle s heating and air conditioning system.
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It s typically wired into the hvac control circuit somewhere between the blower control knob and the blower motor itself.
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When fan speed is changed via the knob on the instrument cluster the blower motor resistor changes setting which changes the speed of the blower motor.
What is a blower motor resistor.
This means that the current running through the blower motor and thus is speed is controlled by the resistor value.
The blower resistor is connected in series with the blower fan.
When you turn a knob to produce more air flow for heat or cool air the resistor adjusts the electrical resistance to control the power sent to your blower motor.
The heater blower motor reduces or increases the amount of air blowing through the dashboard vents based on the fan speed selected or in an automatic climate control system the interior.