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<h2>What does a blower motor resistor do?</h2>
&nbsp;
The blower motor resistor provides multiple resistance levels or speed settings for the blower motor. These settings typically include high, medium-high, medium, and low speeds. To achieve different fan speeds, the blower motor resistor restricts the voltage supplied to the blower motor. This is done by using a series of resistors or electrical pathways that reduce the electrical current flowing to the motor. When you adjust the fan speed on your HVAC control panel, it sends a signal to the blower motor resistor, which then adjusts the resistance and voltage supplied to the blower motor accordingly. This controls the fan speed and, subsequently, the volume of air entering the vehicle's cabin.
&nbsp;
<h2>Signs of a bad blower motor resistor</h2>
&nbsp;
If you observe any of the&nbsp;following&nbsp;signs, it may indicate a bad blower motor resistor in your vehicle:
<ul>
<li>Limited fan speed control: Inability to adjust fan speed, often stuck on high.</li>
<li>No airflow control: Limited or no control over the airflow through the vents.</li>
<li>Intermittent operation: Blower motor works unpredictably, starting and stopping randomly.</li>
<li>High-speed stuck: Fan continuously runs at high speed, even with lower settings selected.</li>
<li>Unusual noises: Blower motor may produce strange sounds like humming or buzzing.</li>
<li>Temperature control issues: Difficulty achieving or maintaining desired cabin temperature.</li>
<li>Electrical problems: Overheating or burnt smell in the cabin, indicating potential electrical issues.</li>
<li>Battery drainage: Blower motor continues running after the vehicle is off, potentially draining the battery.</li>
</ul>

Blower Motor Resistor

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Air Filter Box

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Air Flow Sensor

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Air Intake Duct

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Air Intake Hose

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Air Intake Manifold Actuator Control Solenoid

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Air Intake Manifold Flap Adjuster

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Air Intake Manifold Runner Control Sensor

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Electric Vacuum Pump

Engine Air Duct Assembly

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Engine Air Filter

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Intake Manifold

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Intake Manifold Flap Actuator

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Intercooler

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Oxygen Sensor

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Pressure Sensor

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Throttle Body

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Throttle Position Sensor

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Turbocharger

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Turbocharger Oil Line

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Vacuum Pump

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Air Filters & Intake Systems

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Camshaft Adjuster

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Camshaft Timing Gear

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Camshafts

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Engine Valve Cover

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Harmonic Balancer

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Timing Belt Kit

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Timing Chain Kit

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Timing Cover

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Timing-Control Valve Solenoid

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Valve Lifters Tappet

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Cams, Timing & Valvetrain

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Belt Tensioner

Coolant Level Sensor

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Crankcase Breather Hose

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Crankcase Breather Valve

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Crankshaft Position Sensor

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Engine Oil Dipstick Tube

Engine Oil Filter

Engine Oil Pan Gasket

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Flywheel

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Oil Cooler

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Oil Cooler Line

Oil Filler Cap

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Oil Filter

Oil Filter Base

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Oil Filter Housing

Oil Filter Housing Cover

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Oil Level Sensor

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Oil Pan

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Oil Pump

Oil Pump Drive Gear Shaft

Oil Pump Pickup Tube

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Cranks, Pistons, Oil & Components

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Camshaft Position Sensor

Camshaft Position Sensor & Magnet Kit

Connector Plug

Distributor Cap

Engine Valve Covers & Ignition Coils Kits

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Glow Plug Relay Module

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Ignition Coil

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Ignition Coils & Spark Plugs Kits

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Ignition Distributor

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Ignition Starter Switch

Ignition Switch Actuator

Knock Detonation Sensor

Relay

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Spark Plug

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Spark Plug Wire

Electronic Control Modules, Ignition & Distributors

Engine Wiring Harness

Intake Manifold Repair Kit

Engine Components & Accessories

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Auxiliary Water Pump

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Expansion Tank

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Expansion Tank Mounting Plate

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Fuel Cooler

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Radiator

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Radiator Hose

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Radiator Support Assembly

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Temperature Sensor

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Turbo Hose

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Water Coolant Pipe

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Water Outlet

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Engine Cooling

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Engine Mount

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Engine Mounts

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Catalytic Converter

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EGR Valve

Emissions Fluid Pump

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Exhaust Fluid Heater

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Exhaust Gas Temperature Sensor

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Exhaust Manifold

Fuel Tank Breather Valve

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Fuel Vapor Leak Detection Pump

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Nitrogen Oxide Sensor

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Secondary Air Injection Check Valve

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Vapor Canister Vent Solenoid

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Exhaust & Emission Systems

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Fuel Filter

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Fuel Injection Control Module

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Fuel Injection Pressure Regulator

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Fuel Injector

Fuel Injector Kit

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Fuel Injector Module Wiring Harness

Fuel Line Kit

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Fuel Pump

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Fuel Sending Unit

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Fuel Tank Filler Neck Pipe

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Fuel Tank Strap

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Fuel Systems & Components

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The engine comprises many essential elements such as the lower cylinder block, upper cylinder head(s), and the cooling & lubricating systems. With A-Premium aftermarket engine components, you can expect that your engine deliver years of reliable performance. We offer a diverse selection of engine components from air filters and ignition coils (kits) to fuel pumps to cater to your needs.

BMW 540i Blower Motor Resistor