A Guide to Wiper Arm Replacement for the 2019-2024 Chevrolet Blazer
If new wiper blades didn't fix your problem, the wiper arm is the likely culprit.
- A common issue for the Blazer is wiper arm misalignment causing the wipers to hit each other; this is covered by TSB 25-NA-027 and may only require adjustment.
- The most common failure is stripped splines at the base, where the arm no longer moves but the motor can be heard running.
- A weak spring in the arm, not a bad blade, is the usual cause of streaking or unwiped spots even with new wiper blades.
- A wiper arm puller tool is highly recommended to avoid damaging the part or the wiper linkage during removal.
Signs of a Failing Wiper Arm
When a wiper arm on a 2019-2024 Chevrolet Blazer begins to fail, the symptoms can often be mistaken for bad wiper blades. If you've already installed new blades and the problem persists, it's time to inspect the arm itself.
- Wiper Not Touching the Glass: If you see a large unwiped area in the middle of the blade's path, the arm's spring has likely weakened. It can no longer press the blade firmly against the curve of the windshield.
- Chattering or Skipping: A bent arm or worn pivot point can change the blade's angle, causing it to hop, chatter, or scrape across the glass instead of gliding smoothly.
- Wiper Arm Doesn't Move: If you can hear the wiper motor running but one or both arms aren't moving, the splines inside the arm's base have probably stripped out. The motor shaft is spinning, but the arm can't grip it. 🎬 Watch: How to diagnose a wiper arm that won't move.
- Wipers Hitting Each Other: On the Blazer, if the two front wipers make contact, it's a classic sign of an alignment issue, which is addressed in a technical service bulletin.
Known Issue: Wiper Arm Alignment (TSB 25-NA-027)
General Motors issued Technical Service Bulletin (TSB) 25-NA-027 for the 2019-2025 Blazer because of improper wiper alignment from the factory or after service. Symptoms include wipers hitting each other or parking in the wrong position. This TSB provides a specific adjustment procedure and does not typically require replacing the arms. It involves setting the driver's side blade to reverse its direction 1.6-2.0 inches from the windshield's edge.
🎬 Watch this video to learn how to align your wipers.Choosing the Right Aftermarket Wiper Arm
For the 2019-2024 Blazer, your choices are typically between the original equipment (OEM) part from GM/ACDelco and an aftermarket part from a brand like Motormite (a Dorman brand).
- OEM (ACDelco): This is the part your Blazer was built with. It guarantees a perfect fit, and the material quality is consistent with factory standards. The main downside is a higher cost compared to aftermarket options.
- Aftermarket (Motormite/Dorman): Aftermarket brands specialize in creating replacement parts that meet or exceed the function of the original. For a part like a wiper arm, the design is straightforward, and brands like Dorman are known for providing a reliable, cost-effective alternative that fits and functions correctly. Given that the primary failure points are a weak spring or stripped splines, a new aftermarket arm is a perfectly sound repair choice.
Pro Tip: When replacing a wiper arm, it's a good idea to replace the wiper blade at the same time. This ensures the new arm's spring pressure is applied to a fresh, effective blade for the best possible performance.
Typical Costs for Wiper Arm Replacement
| Part Type | Estimated Cost |
|---|---|
| New OEM (ACDelco) | $35 - $65 |
| New Aftermarket (Motormite) | $74.38 |
| Used OEM | $25 - $45 |
| Shop Labor | $35 - $55 |
Cost estimates are for a single front wiper arm and may vary by location and supplier.
Frequently Asked Questions (FAQ)
Do I need a special tool to replace the wiper arm?
It is highly recommended. The arm can seize on the splined pivot shaft over time. A simple, inexpensive tool called a 'wiper arm puller' makes removal easy and prevents damage to the arm or the underlying wiper transmission linkage. 🎬 See how to use a puller to remove stuck arms. You can often borrow one from an auto parts store's loaner tool program.
Is a Technical Service Bulletin (TSB) the same as a recall?
No. A TSB is a notice sent by the manufacturer to dealerships about a known issue and its recommended repair. The repair is typically only performed if the customer complains about the specific symptom, and it is usually only covered under the vehicle's warranty. A recall is a safety-critical issue that the manufacturer is required to fix on all affected vehicles, free of charge, regardless of warranty status. As of early 2026, there are no active safety recalls for the wiper arms on the 2019-2024 Chevrolet Blazer.
Why are my brand-new wiper blades still streaking?
If you've installed high-quality new blades and they still streak or miss spots, the problem is almost certainly the wiper arm. A weak spring in the arm cannot apply enough pressure to make the blade conform to the windshield, leading to poor performance.
Can I replace just one wiper arm?
Yes. The wiper arms are sold individually, and you only need to replace the one that has failed. However, they are exposed to the same conditions, so if one has failed due to a weak spring, the other may not be far behind.
Helpful Videos
Technical Specifications
OEM Part Numbers: 84946702 (Front Left/Driver Side) 84335406 (Front Right/Passenger Side) 22894224 (Rear)
Material: Steel and Plastic Composite Attachment: Splined pivot with retaining nut
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.
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