Can I use 19 inch wiper blades instead of 18 inch?

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In many cases, yes, you can use 19-inch wiper blades instead of 18-inch ones, but it’s crucial to verify adequate clearance to prevent damage to your vehicle or impaired wiper performance.

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Understanding Wiper Blade Size and Vehicle Specifications

The recommended wiper blade size for your vehicle isn’t arbitrary. Automakers carefully consider factors like windshield curvature, wiper arm geometry, and the overall surface area needing to be cleared for optimal visibility. Deviation from these specifications can impact performance and longevity.

Potential Benefits of Slightly Larger Wiper Blades

While sticking to the manufacturer’s recommendation is generally advisable, there can be minor benefits to using a slightly larger wiper blade, such as:

Increased coverage area: A longer blade sweeps across a larger portion of the windshield, potentially improving visibility.
Improved wiping efficiency: A slightly longer blade might reach areas that the original blade missed, especially in the corners.

However, these potential benefits come with important caveats.

The Risks of Using Larger Wiper Blades

Overlapping and Interference: If the 19-inch blade is too long, it can overlap with other parts of the vehicle, such as the A-pillar, cowl, or even the opposite wiper blade. This interference can cause damage to the wipers, the vehicle, and could even be a safety hazard by obstructing the driver’s view.
Motor Strain: A significantly larger blade puts extra strain on the wiper motor, potentially leading to premature failure.
Uneven Pressure and Streaking: The wiper arm is designed to apply even pressure across the specified blade length. Using a longer blade can disrupt this balance, leading to uneven wiping, streaking, and reduced visibility.
Legal Issues: In some jurisdictions, using non-compliant equipment on your vehicle can be a violation, although this is rarely enforced for minor wiper blade size deviations.
Damage to the Windshield: An oversized blade can exert undue pressure, potentially damaging the windshield itself.

How to Determine if a 19-Inch Blade Will Work

Consult Your Owner’s Manual: This is the most reliable source of information on recommended wiper blade sizes.
Check Online Resources: Many online parts retailers and auto supply websites allow you to enter your vehicle’s make, model, and year to find compatible wiper blades.
Measure the Existing Blade: Confirm the length of your current 18-inch blade using a measuring tape.
Visually Inspect Clearance: With the 18-inch blade installed, carefully examine the area around the windshield when the wipers are in operation. Note any potential points of contact. Then, carefully hold the 19-inch blade in place (without fully installing it) and check for the same potential interference.
Test Fit (Carefully): If the visual inspection seems promising, carefully install one 19-inch blade (leave the 18-inch on the other side). Test the wipers at low speed in dry conditions. Observe for any overlapping, binding, or unusual noises. Do not use the wipers at high speed until you’re sure there are no issues. Never operate wipers on a dry windshield for extended periods.

Common Mistakes to Avoid

Assuming a universal fit: Wiper blades are vehicle-specific. Never assume that any blade size will work.
Ignoring clearance issues: Failing to check for interference can lead to significant damage.
Overlooking the second blade: Remember to consider the length of both blades, especially if they are different sizes.
Forgetting to test thoroughly: A quick visual inspection isn’t enough. Test the wipers in various conditions to ensure optimal performance.
Using excessive force during installation: Wiper blades should snap into place easily. Forcing them can damage the blade or the wiper arm.

Wiper Blade Maintenance

Regardless of the size you choose, proper maintenance extends the life of your wiper blades.

Clean the blades regularly: Wipe the blades with a damp cloth to remove dirt and debris.
Use windshield washer fluid: Always use windshield washer fluid when operating the wipers to lubricate the surface and prevent scratching.
Replace worn blades: Replace wiper blades every 6-12 months, or sooner if you notice streaking, skipping, or chattering.
Protect blades from extreme weather: Park your vehicle in a garage or carport to protect the blades from sun, snow, and ice.
Lift the blades when parked outside in winter: This prevents them from freezing to the windshield.

Frequently Asked Questions (FAQs)

Will using a slightly larger wiper blade void my vehicle’s warranty?

A minor deviation in wiper blade size is unlikely to void your vehicle’s warranty, especially if it doesn’t cause any damage. However, if the larger blade does damage the wiper motor or windshield, the manufacturer could deny warranty coverage for those specific components. Always err on the side of caution.

What happens if the 19-inch blade overlaps with the other wiper blade?

Overlapping wiper blades create significant friction and stress on the wiper motor. This can lead to premature motor failure, as well as damage to the blades themselves. Furthermore, the resulting uneven wiping pattern significantly reduces visibility.

Can I use a 20-inch wiper blade if 19 inches works?

No. Even if a 19-inch blade seems to work, jumping to a 20-inch blade significantly increases the risk of interference and motor strain. Always choose the smallest size that provides adequate coverage.

How do I know if my wiper motor is being strained by the larger blades?

Signs of wiper motor strain include: slow or erratic wiper movement, unusual noises (whining or grinding), and a burning smell coming from the motor. If you notice any of these symptoms, immediately stop using the larger blades and revert to the recommended size.

Is it better to use shorter wiper blades than longer ones?

Using shorter blades is generally safer than using longer ones, as they are less likely to cause interference or strain the wiper motor. However, shorter blades might not provide adequate coverage of the windshield.

What type of wiper blade is best: conventional, beam, or hybrid?

The best type of wiper blade depends on your vehicle and driving conditions. Beam blades generally offer superior performance in all weather conditions, while conventional blades are more affordable. Hybrid blades combine features of both.

How often should I replace my wiper blades?

Wiper blades should be replaced every 6-12 months, or sooner if you notice streaking, skipping, or chattering. Climate and driving conditions also affect wiper blade lifespan.

Does it matter what brand of wiper blade I use?

Yes, the brand can matter. Reputable brands use higher-quality materials and construction, which can translate to better performance and longer lifespan. However, even budget-friendly brands can be effective if properly maintained.

Where can I find the correct wiper blade size for my car?

You can find the correct wiper blade size in your vehicle’s owner’s manual, on online parts retailers’ websites (by entering your vehicle’s information), or by asking a professional at an auto parts store.

Can I install wiper blades myself, or do I need a professional?

Installing wiper blades is a relatively simple task that most people can do themselves. However, if you’re not comfortable with the process, a professional at an auto parts store can typically install them for a small fee.

What if I can’t find 18-inch wiper blades anywhere?

While uncommon, if 18-inch blades are truly unavailable, consult with a trusted mechanic or auto parts specialist. They can offer informed alternatives or possibly suggest a suitable 19-inch blade, provided adequate clearance and proper fit are confirmed.

Should I also replace my windshield wiper fluid when I replace the blades?

It’s recommended to check and top off your windshield wiper fluid whenever you replace your blades. This ensures optimal cleaning performance and helps prevent scratching of the windshield. Using a quality fluid that is appropriate for your climate is always best.

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