heater blower motor resistor

Here are some of the warning signs of a bad heater blower motor resistor:
Fan does not work at all, so no air comes out of the vents.Fan only works on some speeds and not others.Fan only works on the highest speed.Fan runs all the time and can’t be controlled with the fan switch.You see smoke coming out of the vents.

What does the heater blower motor resistor do?

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.

Does blower motor resistor affect heater?

Blower motor resistor / control module problems

In some cars, a failed blower motor resistor can cause a heater fan to stop working completely. In most cases, a blower motor resistor fails due to corrosion or overheating.

What happens when the blower motor resistor goes out?

If the resistor shorts or fails, it may cause the blower motor to remain stuck on one fan speed. The heating and air conditioning systems may still function at one speed, however the resistor will have to be replaced in order for full functionality to be restored.

What are signs of a bad blower motor?

What Are Signs Your Blower Motor Needs to Be Replaced?
Poor or Airflow from Air Vents. This will be the first and most obvious sign your blower motor has a problem. No Airflow At All From Vents. Skyrocketing Energy Bills. Strange Noises When You Turn on the Heat. Overheating Blower / Weird Smells.

How do you test a blower motor resistor?

Place one lead of the Ohmmeter on terminal 1 of the resistor. Place the other lead on terminal 2 and check against specifications. If this circuit is open, showing infinity on the Ohmmeter, the blower resistor must be replaced. Move the lead from terminal 2 to terminal 3 and check this reading against specifications.

How much does a blower motor resistor cost?

The average cost for blower motor resistor replacement is between $109 and $140. Labor costs are estimated between $44 and $55 while parts are priced between $65 and $84. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location.

How do you fix a blower motor resistor?

How to Replace a Blower Motor Resistor
Step 1: Remove the glove box door, if necessary. Step 2: Disconnect the wiring harness and remove screws. Step 3: Remove and replace the blower motor resistor. Step 4: Tighten screws and reattach wiring harness. Step 5: Reinstall the glove box door.

Why is my heater not blowing hot air in my car?

Faulty heater cores and low or contaminated coolant levels often come hand in hand, and both issues may lead to your engine overheating and your heater not blowing hot air.

Why does my heater resistor keeps blowing?

A resistor blows because too much current is going through it. You could try diagnosing the circuit to work out if there’s a fault somewhere else – or you could just fit a beefier resistor.

Why is my heat blowing cold air in my car?

Low Coolant Level

The coolant (usually a mixture of water and antifreeze) in your engine doesn’t just work to keep the engine from overheating: It’s also the source of heat supporting the heating system. If there isn’t enough coolant in your system, the heater core will blow cold air into your car.

Is there a fuse for the heater blower?

The blower motor is powered by a fuse-like device called a relay. If your heater or air conditioner does not blow air through the vents, this could indicate that the blower motor fuse has probably blown. While replacement is easy, the exact location of your blower motor fuse may vary from vehicle to vehicle.

Can I run my car without a blower motor?

Your car’s blower motor is not only necessary for the operation of your air conditioner. Without a functioning blower motor your engine runs the risk of overheating.