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.
Beside this, Can a blown fuse cause heater not to work?
A blown fuse is a symptom not a cause. … If a new fuse blows as soon as the blower is turned on, the heater circuit or motor may have a short that should be investigated. If the fuse lasts a while and then blows, the fan motor is probably running hot due to worn brushes and/or bushings and should be replaced.
Likewise, How do you check if a fuse is good?
Also, What fuse is for the blower motor?
To protect the blower motor power circuit, a 20-, 25- or 30-amp fuse is usually located in the fuse panel under the dash. The rating of the fuse will depend on the vehicle application and how much power the blower motor requires at full speed.
How do you check if a fuse is bad?
Remove the fuse from its holder. In some cases you may need a small screwdriver to unscrew the fuse holder cap. Look at the fuse wire. If there is a visible gap in the wire or a dark or metallic smear inside the glass then the fuse is blown and needs to be replaced.
18 Related Question Answers Found
How can you tell if a small fuse is blown?
Remove the fuse from its holder. In some cases you may need a small screwdriver to unscrew the fuse holder cap. Look at the fuse wire. If there is a visible gap in the wire or a dark or metallic smear inside the glass then the fuse is blown and needs to be replaced.
How do I test a fuse with a multimeter?
Why is my 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.
Where is the fuse for the heater blower motor?
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 you check a fuse without removing it?
By using a test light or multimeter you can find blown flat bladed type fuses without removing them. These fuses have 2 contacts on the top of them. Test light method: Turn the ignition on (to energize more circuits).
Can you test a fuse in circuit?
Another way to test the fuse is by measuring the voltage across it with a digital multimeter. This is helpful if the fuse is not able to be easily removed from the circuit. To do this, leave the circuit powered on and switch your meter to measure voltage. Make sure to select DC for DC circuits and AC for AC circuits.
How do you test a fuse without removing it?
By using a test light or multimeter you can find blown flat bladed type fuses without removing them. These fuses have 2 contacts on the top of them. Test light method: Turn the ignition on (to energize more circuits).
Can a fuse be blown and not look like it?
Due to the way fuses are engineered, the likelihood that a fuse would become faulty without blowing is pretty slim, but there are rare instances in which a fuse might appear completely fine, even though no current runs through it.
Why is my heater not blowing heat?
When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack. Do this: Turn off your furnace at the thermostat, and check the furnace filter. … If the pilot light isn’t lit, then the furnace’s burners won’t light, meaning no heat.
How do you test if a fuse is good?
To test if the fuse is blown, we require a multimeter. Once configured, a multimeter can measure the resistance of the fuse element. Resistance is measured in Ohms ‘Ω’. The following tutorial uses a digital multimeter, however the same principles apply when using an analogue multimeter (ie.
What can cause a blower motor to stop working?
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. … In most cases when a blower control module fails, the blower motor doesn’t work at all.
Why would a heater suddenly stop working?
Dirty filters are the most common cause of furnace problems. Dust and dirt restrict airflow—and if the filter gets too clogged, the heat exchanger will overheat and shut off too quickly, and your house won’t warm up. If the blower is running but no heat is coming out, replace the filter.
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