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Replacing a Blower Motor

Blower motor

A few days ago, we talked about diagnostics to find what might be wrong with a blower that isn't sending hot or cold air through the cabin. We discussed blower motor diagnostics, so now we'll talk about replacing a blower motor that has been found to be bad. This entire conversation began when user tjFleming75 had a problem with a Kia Rio.

What Causes a Blower Motor to Break?

The most common cause is dust or debris getting into the motor's bearings, causing them to fail. Something may also get caught in the blades of the blower's fan, causing them to cease rotating and the motor to burn itself out.

Replacing the Blower Motor

Most blower motors are mounted on the firewall, on the engine's side, and usually on the passenger's side of the vehicle. Some may be located closer to the center of the engine compartment, on that firewall, and a few will be located inside the cabin behind the dashboard.

Wherever it's located, replacement begins with disconnection of the battery for safety. Then disconnect the plug from the blower motor and any ground wire that may be screwed on.

Then unscrew the screws/bolts which hold the blower motor in place. Often the motor and fan will be situated within a housing. It's not likely that you'll need to remove that housing, just the motor and fan mounted to it.

On some vehicles, other items in the engine compartment may be blocking access to the motor for removal. Those will have to be removed or pushed aside.

Once the blower motor is removed, clean out the mount, duct work, etc. with a shop vacuum and hose attachment. Be sure that any gasket material and other matter is cleaned up and replaced before the installation of a new blower motor.

Installation of the new blower motor is the reverse of removal. Run a few tests to make sure the motor is working properly.

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