13 results for Blower Motor Resistor

What is a Blower Motor Resistor?

A blower motor resistor is an electrical component that controls the speed of the blower motor fan. Within the HVAC system, it’s also called “HVAC blower resistor”, “car ac blower resistor”, or “fan blower resistor”. By adjusting the voltage sent to the blower motor, it allows the fan to operate at different settings to maintain a comfortable cabin temperature.

What does a Blower Motor Resistor do?

The blower motor resistor regulates the electrical current through the circuit. At lower fan speed settings, more resistance is applied to reduce motor speed. At higher settings, less resistance is used, allowing the blower motor to spin faster.

Where is the Blower Motor Resistor Location?

The blower motor resistor location varies by vehicle, but it's typically mounted near the blower motor itself. You can find it on the HVAC housing, air duct, or behind the glove box.

What are the Symptoms of a Bad Blower Motor Resistor?

In most cases, failure symptoms of a blower motor resistor include the fan not responding properly at certain speed settings and the resistor overheating. If you see any of the following signs, it may be time to inspect your blower motor resistor.

1. The blower motor only works on high speed, or its fuse keeps blowing.
2. The blower motor only works on low speed.
3. The fan works intermittently or stops unexpectedly.
4. The blower motor resistor shows signs of burning out.
5. The connector is melted.
6. You hear the switch click, but the airflow through the vents is weak or absent.

How to Test a Blower Motor Resistor with a Multimeter?

Testing a blower motor resistor is a straightforward task for a DIYer.

1. Locate your resistor and disconnect its electrical connector.
2. Set the multimeter properly and connect it to the resistor terminals.
3. Measure its resistance across different terminals.
4. Compare the reading with the normal specification.

If any reading shows infinite resistance (open circuit) or zero resistance (short circuit), your resistor is faulty and needs to be replaced.

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FAQ

What Happens if Blower Motor Resistor Goes Out?

A failed blower motor resistor can cause loss of proper fan speed control. In many cases, the blower motor will only work on high speed. In other situations, it may not work at all or may only operate at certain speeds.

Can you Bypass a Blower Motor Resistor?

Yes, bypassing a blower motor resistor is used as a temporary diagnostic step. This includes wiring the blower motor directly to power, skipping the resistor entirely. The fan works only at full speed, which may reduce its lifespan. For proper function, it’s recommended that you replace the faulty resistor sooner.

How to Change a Blower Motor Resistor?

Many DIYers can complete the blower motor resistor replacement in about one hour.

1. Locate the resistor
2. Disconnect the electrical connector from the resistor.
3. Remove the mounting screws (typically 2-3 screws) and pull out the old resistor.
4. Insert the new replacement resistor and secure it with the screws.
5. Reconnect the electrical connector and test all fan speed settings to confirm proper operation.

If you’re looking for a direct-fit blower motor resistor, ours come with required gaskets and seals, for easy installation with no modification needed.

Will a Blower Motor Work Without the Resistor?

In most vehicles, the blower motor will still work without the resistor, but only on the highest speed setting. Power is sent directly to the motor, and the lower speed setting will not function. Some newer vehicles may not operate the blower at all if your resistor circuit is open.

Will a Blower Motor Resistor Stop AC from Working?

The air conditioner compressor can still work normally even if the resistor fails, but airflow to the cabin is limited.

Is a Blower Motor Control Module the same as a Resistor?

A blower motor control module is not exactly the same as a blower motor resistor. While both control the fan speed, the resistor uses fixed resistive elements to set specific speed levels, whereas the control module uses electronic circuits to provide variable, continuous fan speed control.