What happens when a heater blower motor goes bad?

Power to the blower motor is fed through the blower motor resistor, so if it fails or has any issues power can be cut off to the motor. A blower motor without power will not be able to produce any air pressure, and as a result the heating and air conditioning system will be left with no air coming from the vents.

Where is the heater blower fan?

The blower motor is usually under the dashboard on the passenger side. Blower motors that make loud squeaks or rattling noises may be worn out and on the verge of packing it in, but sometimes those noises are caused by leaves or other debris that can be cleaned out after the motor is removed from the vehicle.

Why won’t my heater fan come on?

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.

Why is my heating fan not working?

What fuse controls the heater fan?

Because of the volume of air that is moved by the blower fan, the motor may pull up to 20 amps or more at high speed. To protect the blower motor power circuit, a 20-, 25- or 30-amp fuse is usually located in the fuse panel under the dash.

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.

Where is the blower 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.

What causes car heater fan to stop working?

After removing the blower, you might find a squirrel cage so clogged with debris that the motor can’t operate. In other cases, a broken wire, rusted connections, or a disconnected pigtail assembly might be the issue. If the blower doesn’t receive power, check that the blower fuse isn’t blown.