The blower motor is one component that you might need to replace if the HVAC system isn’t working properly. Let’s take a look at what the blower motor does and some tips for changing it if it wears out.
What Is a Blower Motor?
If the system’s set to cool, the blower motor only blows air through the A/C evaporator, then into the cabin through the registers.
When the A/C is working, the evaporator will dehumidify the air. But even when the A/C isn’t engaged and the system is set to heat, the blower’s air always passes through the evaporator before passing through the heater core. It does this because, on defrost, the A/C compressor will be engaged automatically so the evaporator can dehumidify the air before it ever reaches the windshield.
If your vehicle’s HVAC system has airflow issues, it’s possible that the blower motor is malfunctioning and needs to be replaced. An inoperative relay or heater controls can also lead to HVAC airflow problems. It’s best to bring your vehicle to a trusted auto repair shop so they can diagnose and repair any HVAC system issues unless you’re a confident DIY person.
Blower Motor Replacement Breakdown and Tips
Locating the Blower Motor
It will either be under the dash on the passenger side or accessible under the hood, but it’s always on the passenger side of the vehicle, never on the driver side.
Vehicle Preparation
Make sure the key is switched to the OFF position (you don’t need to disconnect the battery to do this job). Remove anything that’s in the way; this includes the lower trim panel underneath the glove box. On many vehicles nothing is in the way. The bolts may require a long ¼ inch extension and wiggle socket to get to the harder to reach fasteners holding the blower in place.
The blower resistor will be near the blower. You may need to look up where it’s located, but always check it for heat damage and melting when you’re replacing the blower motor. Sometimes the resistor is the only problem and the blower motor is just fine.
Always check the blower resistor for heat damage and melting when you’re replacing the blower motor. Sometimes the resistor is the only problem and the blower motor is just fine.
– Richard McCuistian, ASE Certified Master Automobile Technician
Blower Motor Removal
There will likely be three to six bolts holding the motor in place. Afterwards, the entire blower motor assembly can slide out, but it may be tight. That squirrel cage requires quite a bit of space, so be careful while sliding it out of there.
Properly Installing the Replacement Blower Motor
To install the new blower motor, orient it based on how the old blower motor was facing. Check to see if any gaskets need to be replaced.
Pro Tips are nuggets of information direct from ASE-certified automobile technicians working with CarParts.com, which may include unique, personal insights based on their years of experience working in the automotive industry. These can help you make more informed decisions about your car.
Pro Tip: Some blower motors will have a foam gasket around the flange, and if they do, the new blower motor will usually come with one already in place.
After plugging in the power connections, test the blower through all its speeds. If your vehicle has a cabin air filter, replace it too.
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