Testing whether there’s power flowing to the blower in the first place is a good way to rule out a bad motor. To test a resistor or motor, you’ll need to know the basics of electrical circuitry and have access to a multimeter and the proper electrical specifications for the involved circuits. Take time to determine the cause of your airflow woes before replacing parts. There may be no airflow at all, which could be a sign that the resistor has completely failed, the blower motor is bad, it has a broken module or a relay is failing.Air flows, but only at high speeds, and other settings no longer work.When it fails - usually due to corrosion or overheating - you may notice a few things: The blower motor resistor is a single part, often with several possible pathways for current flow that provide more or less resistance, depending on the demand from the dash setting. The more power supplied, the higher the fan speed and the stronger the airflow. On the dash, each setting effectively represents a different current flow: When you select a low setting, you’re sending less power to the blower motor, which is achieved by more resistance, and when you select a high setting, you are sending more power to the blower motor, which is achieved by less resistance. The heating and air-conditioning system uses several resistors to supply the desired airflow by sending power to the blower motor. When they fail, they supply either too much or too little current to a component. Static resistors are designed to supply current at a constant level under specific resistances. The higher the reading, the more resistance there is.
#Fan control for a blower motor in a car full
An OL reading on a multimeter likely indicates a full break in the circuit, meaning the resistance is too great to read from one test to another. Resistance is measured in ohms and can be anywhere from zero to OL (open loop). Resistors are used in electrical circuits to lower current by, you guessed it, resisting flow. Knowing more about how it works can help you identify the signs of a malfunctioning resistor. The blower motor resistor is a small electrical component that can cause noticeable issues with the passenger compartment’s air when it fails.
Some of these parts will (hopefully) last throughout the life of your car, but others are more prone to wearing out and need replacement. Your vehicle’s heating and air conditioning system consists of many parts working in unison to produce your preferred air temperature.
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