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What causes heater blower not working?

Author of the blog (work in a car repair shop)

Created: 2022-08-11 19:45:58

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What causes heater blower not working?

If little air is coming through the vents (hot or cold), then it could be because the blower motor for the fan or a switch or resistor that controls fan speed isn't working. Another cause might be that the electronically controlled “blend doors” that direct air flow are stuck or broken.Wait a few minutes to see if your furnace cycles back on and the blower starts once again. Sometimes the furnace blower isn’t working because the thermostat is set too low. Over the summer or more recently, someone may have accidentally lowered the thermostat temperature.

Is there a fuse for the heater blower?

Many vehicles have two fuses for the blower motor, one in the interior fuse block and the other under the hood. The blower motor is usually under the dashboard on the passenger side.

How do I know if it's my blower motor or resistor?

Typically, if the fan will work on some speeds but not on others, the resistor is suspect. Okay, let's say there's no melting going on, but your fan doesn't work on all speeds. Typically, if the fan will work on some speeds but not on others, the resistor is suspect.

How do I know if my heater fuse is blown?

You can quickly determine by checking resistance with a multimeter. A good fuse will have nearly zero ohms of resistance, if the fuse is blown there will be no reading.

Where is the blower motor relay fuse located?

Under the instrument panel, look under the glove box. On the right side of the fender wall you will find another fuse box. The blower motor fuse is easy to replace.

Where is the blower motor reset button?

Locate the reset button on the furnace and press it to reset the furnace. It is usually located inside the blower compartment on the side of the blower motor. Be cautious as the housing may be hot. If the button is popped up, press it down.

How much does it cost to replace a heater blower motor?

Furnace Blower Motor Replacement Cost On average nationwide, a furnace blower motor replacement costs $400 to $600, including parts and labor. A single-speed blower motor costs around $450 to replace while a variable-speed motor costs $600 or more. You'll also need to budget labor, about $75 to $125 per hour.

How much does it cost to replace blower motor resistor?

How much does a blower motor resistor cost? To replace the blower motor resistor, it would cost you anywhere between $50 to$150 – this includes the cost of equipment and labor. However, by doing it yourself at home, you can save up to $70.

Where is the heater blower resistor located?

The heater blower motor resistor is often found beneath the dashboard. It is located in the heater and air conditioning compartment. It's connected to the air conditioning system, where it can adjust the speed of the blower motor fan. It can also be found behind the glove box of some vehicles.

How much does it cost to fix a heater resistor?

The average cost to replace the blower motor resistor at a repair shop is between $44 and $55 in parts and $70 in labor costs, for a total cost of around $114 to $125.

Where is the fuse for the heater?

Fuses. If your furnace has a fuse, it will probably be located in the control box with the blower. BIf you can't locate it, the transformer may have burned up and will need to be replaced. Once you've located the fuse, check its wires to see if they're broken or look for signs of discoloration or cloudiness.

What fuse controls the heat in a car?

The blower fuse is a 40 amp fuse located in the engine compartment's fuse box.

Where is the reset button on my furnace?

Locate the reset button on the furnace and press it to reset the furnace. It is usually located inside the blower compartment on the side of the blower motor. Be cautious as the housing may be hot. If the button is popped up, press it down.

Does a blower motor resistor have a fuse?

A fuse is often located on the resistor board. The fuse only protects the low and medium blower speeds. High speed will still work if the resistor fuse is blown.

What relay controls the blower motor?

The blower motor relay controls the current used to power the blower motor, and is subject to the constant on and off switching.

How do you test a blower motor relay?

Connect a test light or multimeter to the ground (black lead). Turn the ignition key to the on position (engine off), and remove the relay. Using the probe, test all terminal sockets in the relay connector. Two of the four should have power.

What causes blower motor failure?

Blower motor breakdown can be the result of anything from old age to failed bearings, high amp draw, electrical failure in the windings, dirt accumulation, and more. “The most common cause is dirt accumulation due to lack of maintenance,” said Tom Beaulieu, president of Bay Area Services Inc.

Is it hard to replace a blower motor?

The replacement of the blower motor is common and straightforward, so most shops will perform the repair — many on the same day.

How long does it take to fix a blower motor?

How long does it take to replace a blower motor? Replacing a blower motor takes 2 to 3 hours on average. The blower motor is typically located behind a control board and other furnace parts.

How often do blower motors go out?

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.

Should you replace blower motor and resistor at the same time?

We do suggest that you replace the resistor at the same time. It may not be critical, but this will keep the system more uniform. The issue may even be related to the resistor. If you know that it is not related to the issue, then you do not have to replace it.

Why is my blower fan not working?

If you see or hear the fan turn on, your blower motor is not the culprit. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not trip). While your thermostat may be at fault, only an HVAC technician can diagnose and remedy the issue correctly.

Will a blown fuse cause my heater not to work?

Faulty Wiring or Blown Fuses Similar to your broken HVAC controls, your car's wiring could be broken or have a short in it. This would mean the heater isn't triggered when the driver commands it to function.

Does a blower motor have a relay?

In a blower motor, the relay supplies the power that allows the fans to circulate warmed air. Essentially an on/off switch, the blower motor relay's reactions start and end the heating process in HVAC systems by controlling the flow of current between the power source and the motor.

How much does a furnace fuse cost?

The expense ranges from $30 to $300 for fuse replacement.

Is your heater blower motor not blowing air?

Here's how to tell your blower motor resistor is bad When you sit behind the wheel of your vehicle, you expect the climate controls to work as directed. So, what happens when the system isn’t blowing air as you demand? In some cases, it could be a bad heater blower motor resistor causing your trouble.

Why does my heater blower motor resistor keep going bad?

The heater blower motor resistor can often go bad because of a bad heater fan, and therefore you often have to replace both the heater blower resistor and the fan. It’s also not a difficult part to replace. It might take you more time to diagnose the problem versus replacing the resistor.

Why does my heater stop working when I turn it on?

The system’s heat exchanger cannot work unless there’s sufficient air moving across it to stop it from overheating. In short, a dirty blower can cause the heat exchanger to fail. Dirty air filters could also be the reason your heater stopped working. Such filters restrict the airflow and could even worsen existing issues with wrong duct sizing.

What causes a blower motor to stop working on a car?

If the blower motor resistors’ internal components fail it may cause the blower motor to malfunction, or not function at all on one or more of the settings. This can also be caused by a blower motor switch, so a proper diagnosis is highly recommended if you are uncertain of what the issue may be.

Below you will find two interesting articles on a similar topic 👇

How do I know if my blower motor fuse is blown?
How do I reset my AC blower?

Tired of looking for a video for your question?

Video Answer below 👇

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