Experts Guide For Blower Motor Replacement

A heater blower motor replacement draws air into a car’s climate control system and forces it through the numerous vents using a special “squirrel cage” construction. Depending on the needs of the passenger and the vehicle, this air will either pass via the heater or evaporator core. A switch in the climate control center and a blower motor resistor control the blower motor’s high amperage requirement.

What Signs Might Point Towards A Broken Heater Blower Motor?

When the temperature control is turned on, if there is no airflow from the vents, the blower motor replacement has probably burned out. The blower motor will work harder, draw more amperage, and eventually overheat if there is water in the air intake, there is a lot of moisture in the air, or the cabin air filter is clogged. The main issue here is that the amperage demand may potentially cause the resistor and the control unit to overheat and catch fire.

How Harmful Is A Heater Blower Motor Malfunction?

Although it won’t leave you stranded on the side of the road, a broken blower motor replacement might make driving difficult in extreme winter or summer temperatures. Find a good mechanic if you don’t want to shiver or perspire. Most shops will perform the repair because replacing the blower motor is common and simple, and many will do it on the same day.

Covering vents prevents the return vent from pulling the cold air out of that room. This disrupts your system’s airflow and can cause heating and cooling problems. So save yourself the trouble and leave those vents uncovered!

Inside the heating and air conditioning duct of an automobile is the blower motor, a little electrical motor. By bringing air from outside the car and blowing it across the heater core, the blower motor circulates air inside the heater core. The passenger cabin is then heated using this heated air. Your car’s blower motor may stop working suddenly or with little to no warning, but if you notice that your heater isn’t working properly or hear a grinding or scraping sound coming from the firewall on the passenger side of the car, it may be time to replace the blower motor.

Changing A Blower Motor

You’ll learn complete details about how to change a blower motor. Learn more about air duct dry fogging disinfection.

Removing A Blower Motor

Step 1

The negative battery terminal’s ground line should be disconnected. Use a wrench to loosen the retaining bolt. The terminal’s clamp should be removed.

Step 2

On the passenger side of the majority of vehicles, you can find it inside the engine bay along the firewall. On some automobiles, it might be found inside the cabin, on the driver’s side of the car, beneath the dash.

Step 3

Using your hand, detach the blower motor’s electrical connector or connectors. There will often be just one plastic connector. Use masking tape and a marker to designate them for reassembly if there are more.

Step 4

The screws holding the blower motor to the heater case or firewall should be removed using a socket.

Step 5

As a unit, remove the blower motor and fan blades from the car.

Step 6

Utilizing a socket, unscrew the nut holding the fan blades to the motor. Fan blades should be pulled away from the motor.

Blower Motor Replacement:

Step 1

Place the replacement motor’s fan blades in place by dropping them.

Step 2

The nut holding the fan blades to the motor must be tightened.

Step 3

In the heater case or firewall, slide the motor/fan blade assembly into place.

Step 4

The blower motor is fastened to the heater case or firewall with screws.

Step 5

Onto the back of the blower motor replacement , press the plastic wiring connector.

Step 6

Reattach the ground line to the battery’s negative terminal. With a wrench, tighten the retaining bolt after sliding the clamp over the terminal. To ensure proper operation, test the motor.

Moreover, learn more about kitchen hood duct installation.

How To Install A Blower Motor


Tongs for sockets


axle puller



  1. Cut off the blower motor’s electrical power source.
  2. Your furnace’s blower motor is covered by a panel that must be removed.
  3. Find the bolts or screws holding the motor housing to the frame and remove them.
  4. Take images of the wiring connecting the motor to the furnace with your phone. You may reconnect everything using the instructions in the drawings.
  5. Cut the motor cables off at the main unit.
  6. Motor housing can be removed.
  7. The screw next to the motor shaft should be loosened.
  8. Screws and capacitor leads should be undone on the motor’s backside.
  9. The hub puller must be unscrewed so that it can pass over the motor shaft.
  10. Hub puller’s side bolts should be tightened until they firmly grasp the shaft.
  11. To release the motor, turn the hub puller in a clockwise direction. As you do this, support the motor.
  12. Move the motor out of the housing with caution.
  13. To remove the belly band, remove the screws on the motor.
  14. Place the replacement motor so that it rotates in the same direction as the fan’s airflow.
  15. Place the motor in the center of the fan wheel, then attach the bolts and capacitor leads on the back.
  16. Reconnect the motor set screw on the opposite side.
  17. Reinstall the engine and its housing in the furnace, then bolt them in place.
  18. After that, reconnect the wires. 
  19. Restore the unit’s power, then test the replacement motor.


In conclusion, we can say that it is easy to perform blower motor replacement. One can easily do it at home.

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