Buick Allure HVAC Blower Motor Resistor Guide (2005-2010)
If your Allure's fan speeds are acting up, the blower motor resistor is the likely culprit.
- The most common symptom of failure is the fan only working on the highest setting.
- Always inspect the wiring connector for melting or corrosion and replace it if damaged.
- Replacement is easy for DIYers and located under the passenger side dashboard.
- If resistors fail repeatedly, the blower motor is likely drawing too much current and should be replaced too.
Is Your Buick Allure's Blower Resistor Failing?
When the blower motor resistor in your 2005-2010 Buick Allure starts to fail, the signs are usually obvious. Because this part takes a lot of electrical load and heat, it's a common failure point in the HVAC (Heating, Ventilation, and Air Conditioning) system. Understanding the symptoms can help you confirm the problem before you buy a new part.
Symptoms of a Bad Blower Motor Resistor
- Fan only works on the highest speed: This is the most common symptom. The highest setting bypasses the resistor, sending full power directly to the blower motor. If lower speeds don't work but the highest does, the resistor is almost certainly bad.
- Some, but not all, fan speeds are gone: You might lose one or two specific speeds while others still function. This happens when one of the resistor coils inside the part burns out.
- No air from vents at any speed: While this can also point to a failed blower motor, a completely failed resistor can also be the cause.
- Burning smell from vents: A failing resistor can overheat, causing a plastic or electrical burning smell. This is a serious sign, as it can melt the wiring connector, creating a fire risk.
Check the Wiring Harness!
A common cause for repeat resistor failure is an old, power-hungry blower motor that overheats the new part. An overheating resistor can melt the electrical connector (pigtail). Always inspect the connector when replacing the resistor. If it shows any signs of melting, browning, or corrosion, you MUST replace it along with the resistor to prevent future failures. Many aftermarket kits include a new harness for this reason.
Choosing the Right Aftermarket Resistor
For the 2005-2010 Buick Allure (and its U.S. equivalent, the LaCrosse), you have several reliable aftermarket options. The original OEM part is always an option, but quality aftermarket brands provide comparable performance for less money.
- Standard Ignition (SMP): Often considered a top-tier aftermarket brand for electrical components. They are known for quality and reliability that often meets or exceeds OEM standards. Four Seasons is part of the Standard Motor Products family.
- Four Seasons: A well-known brand in the HVAC parts world. They offer a full line of components and are generally considered a good, reliable choice for daily drivers. Some users have had positive long-term experiences with their products.
- Holstein: Holstein is another established aftermarket supplier providing a range of sensors and electrical parts for various vehicles.
Pro Tip: When a blower motor resistor fails, it's often because the original blower motor is getting old and drawing too much electrical current, causing the resistor to overheat. If you are on your second or third replacement resistor, consider replacing the blower motor at the same time to solve the root problem.
Cost of Replacing a Blower Motor Resistor (2005-2010 Buick Allure)
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Part | $56.81 - $94.35 |
| Shop Labor | $57 - $95 |
| Total Professional Replacement | $113 - $190 |
Frequently Asked Questions
Where is the blower motor resistor located on my Buick Allure?
The blower motor resistor is located in the passenger-side footwell, underneath the dashboard. It is mounted right next to the blower motor itself, inside the HVAC housing. You will need to remove a lower trim panel to access it.
Is this a difficult part to replace myself?
No, this is a very DIY-friendly repair. It typically involves removing a few screws and disconnecting an electrical plug. The most difficult part is working in the tight space under the dashboard. The job usually takes less than an hour.
Do I need to disconnect the battery?
Yes, it is always recommended to disconnect the negative battery terminal before working on any electrical components in your vehicle to prevent short circuits or injury.
Why are there different 5-pin and 7-pin versions?
Different HVAC systems (manual vs. automatic climate control) can use different resistors. It is critical to verify the correct part for your specific vehicle. A 2005 model, for example, often uses a 5-pin connector. Always match the new part to the old one you are removing.
Are there any recalls for this part on my Buick Allure?
There are no specific recalls for the blower motor resistor on the 2005-2009 Buick LaCrosse/Allure. There was a major ignition switch recall (NHTSA 14V355) for this vehicle, but it is unrelated to the HVAC system. Always check for recalls using your vehicle's VIN on the NHTSA website.
Technical Specifications
OEM Part Numbers: 89018778 1581638 973-508
Typically a 5-pin blade style connector. Some systems may vary, so visual confirmation is recommended.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Buick Allure: