Buick Regal Window Motor Replacement Guide (1976-1987)
Fix your G-Body Regal's slow or dead power window with the right aftermarket motor.
- Slow window speed is the most common symptom of a failing motor in a 1976-1987 Regal.
- Replacing the motor is a DIY-friendly job that requires drilling out the original rivets.
- Always clean and lubricate the window regulator tracks with synthetic grease to prevent damaging the new motor.
- Aftermarket brands like Dorman are the standard replacement, as original GM parts are no longer made.
Is Your Regal's Window Motor Failing?
On a classic car like the G-Body Regal, window motors fail from decades of use. The internal components wear out, leading to noticeable problems. Don't wait until your window is stuck down in a rainstorm. Look for these common symptoms:
- Slow Operation: The window moves up and down much slower than it used to. This is the most common first sign of a dying motor.
- Stops and Starts: You have to press the switch multiple times to get the window all the way up or down.
- Grinding or Clicking Noises: Sounds from inside the door when you use the switch often mean the gears inside the motor are stripped and failure is imminent.
- No Movement at All: If you hear a click but the window doesn't move, the motor has likely seized. If you hear nothing, you should check the fuse and switch before condemning the motor.
Choosing the Right Aftermarket Window Motor
Original GM window motors for this era are no longer in production. Aftermarket parts are the standard for this repair. The good news is they are affordable and readily available.
Brand Tiers:
- Dorman: A well-known aftermarket brand that many mechanics trust. Dorman parts are generally considered a reliable, standard replacement. They often engineer their parts to solve common failure points and may include helpful hardware, like the bolts needed to replace the factory rivets on your Regal.
- Replacement: This is a house or generic brand that offers a cost-effective solution. These parts are designed to function like the original and will get your window working again. For many owners, they are a perfectly acceptable choice.
Since both brands are priced identically for your Regal, choosing Dorman provides the assurance of a widely recognized name in the aftermarket industry.
Estimated Costs for Window Motor Replacement
| Part Type | Price Range |
|---|---|
| New Aftermarket (Dorman, Replacement) | $54.78 |
| New OEM (GM) | Not Available |
| Used OEM | Varies by Salvage Yard |
| Shop Labor Cost | $120 - $250 |
Pro Tip: Clean and Lubricate for Longevity
The single most important thing you can do when replacing your window motor is to clean and lubricate the window regulator tracks inside the door. Old, hardened grease and dirt in the tracks make the window harder to move. This extra resistance can burn out a brand-new motor quickly. Use a degreaser to clean the old gunk out of the tracks, then apply a fresh coat of synthetic grease or white lithium grease to all moving parts.
Frequently Asked Questions
Do I have to drill out rivets to replace the motor?
Yes, the original factory motors are typically held to the regulator with steel rivets. You will need to drill or grind these out to remove the old motor. New aftermarket motors almost always come with a set of nuts and bolts to make installation easier.
Why is my new window motor still slow?
If a new motor doesn't fix the speed issue, the problem is almost always stiff, dirty, or unlubricated window regulator tracks. The motor is fighting against too much friction. Another possibility on G-bodies is a poor ground connection to the door, which can be improved by running an extra ground wire.
Do I need to replace the whole window regulator?
You only need to replace the regulator assembly if it is physically bent, cracked, or if its large gear is stripped. If the regulator moves freely by hand (when the motor is removed), you likely only need the motor.
Is the driver's side motor the same as the passenger's side?
No, they are typically different parts. The motors are mounted in mirror image and are not interchangeable. Always verify you are ordering the correct motor for the specific door you are repairing.
Technical Specifications
This is a direct-drive motor. Check that the replacement is specified for the correct year and door (Left/Driver or Right/Passenger). Replacement often requires drilling out factory rivets and installing with supplied bolts.
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.