Chevrolet Impala Window Motor Guide: 1987-1991
Is your 1987-1991 Impala's power window slow, stuck, or noisy? Here’s what you need to know before you buy a new motor.
- Failure is common due to age; slow operation is the first sign of a dying motor.
- No recalls or TSBs exist for this issue; it's a standard wear-and-tear item.
- Aftermarket brands like Dorman or Cardone are cost-effective and popular for this repair.
- Replacement requires drilling out factory rivets, so be prepared with the right tools for a DIY job.
Is Your Window Motor Failing? Common Symptoms
A window motor on these GM vehicles rarely fails suddenly. It usually gives warning signs. Knowing these signs can help you figure out if the motor is the problem or if it's something else, like the switch or the regulator.
- Slow Window Speed: This is the most common sign of a worn-out motor. The window moves up and down much slower than it used to, especially when going up. This happens because the old motor is losing its strength.
- Window Stops Moving: The window might go up or down part-way and then stop. You may need to press the switch several times to get it to close completely.
- Clicking or Grinding Noise: If you hear a clicking or grinding sound from inside the door when you press the switch, but the window doesn't move, the motor's internal gears may be stripped.
- No Sound or Movement: If nothing happens when you press the switch (no click, no motor hum), the problem could be the motor, but it's also very likely a bad fuse, a faulty switch, or broken wires in the door jamb.
Pro Tip: Test Before You Replace
Before buying a new motor, it's wise to confirm the old one is truly dead. A mechanic can do this, or if you're comfortable with basic auto electrics, you can remove the door panel and use a 12V power source to test the motor directly. This test bypasses the switch and vehicle wiring to confirm if the motor itself has failed.
Known Issues, Recalls, and Service Bulletins
For the 1987-1991 Chevrolet Impala and its sibling, the Caprice, there are no active recalls or specific Technical Service Bulletins (TSBs) from the National Highway Traffic Safety Administration (NHTSA) for power window motor failure. Failures on these vehicles are almost always due to the age and normal wear of the part.
Choosing a New Aftermarket Window Motor
For a vehicle of this age, an aftermarket window motor is the most common and practical choice. OEM parts from GM (ACDelco) may be available, but they are often more expensive. Aftermarket brands offer good value and are widely available.
Brand Tiers
- Good (Economy): Brands like Dorman, Cardone (A1 Cardone), and A-Premium are popular choices. They are affordable and many come with a lifetime warranty. While some users report long-term success, quality can sometimes be inconsistent. Given the low price, many owners find them to be a worthwhile repair.
- Better (OEM-Equivalent): ACDelco is GM's official parts brand and is considered the original equipment. While it offers a promise of factory quality, some forum users have noted that these parts may be made in the same factories as aftermarket brands.
A Note on "No-Name" Brands
Be cautious of extremely cheap, unbranded motors found on some online marketplaces. Forum discussions show that these often perform poorly, are noisy, and may fail quickly. Sticking with a recognized aftermarket brand is a safer bet.
Estimated Costs for Window Motor Replacement
| Part or Service | Estimated Cost |
|---|---|
| New Aftermarket Motor | $25 - $60 |
| New OEM (ACDelco) Motor | $70 - $120 |
| Shop Labor | $100 - $200 |
| Total Professional Replacement (Aftermarket) | $125 - $260 |
*Cost estimates are for a single window motor and do not include taxes or diagnostic fees. Prices can vary by location and supplier.
Frequently Asked Questions
Do I need to replace the window regulator at the same time?
Not always. If the window moves smoothly in its tracks (when helped by hand) and the only problem is the motor's function, you can often replace just the motor. However, if you hear grinding noises or the window is off-track, the regulator might be damaged. On these cars, the motor is bolted to the regulator.
Is replacing the window motor a DIY job?
Yes, for those with some mechanical experience. The process involves removing the door panel, speaker, and weather shield. The original motor and regulator assembly is held in with rivets that must be drilled out. The new motor is then typically installed with bolts. Taping the window glass in the full 'up' position is a critical safety step.
Why is my new motor still slow?
If a new motor runs slow, the problem may not be the motor itself. The window channels (the rubber guides for the glass) can become dry and dirty, creating too much friction. Cleaning the channels and lubricating them with a silicone spray can make a big difference. Also, check for poor electrical connections or a weak ground.
Does it matter which door the motor is for?
Yes. While the motors may look similar, they are often designed to spin in a specific direction for a particular side of the car (driver vs. passenger) and position (front vs. rear). Always verify that you are buying the correct part for your specific door.
Technical Specifications
The motor for this vehicle is a direct-drive unit that bolts to the window regulator assembly. The original assembly is riveted to the inner door structure.
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.
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