Wiper Blades and Washer Fluid: When to Replace and What to Use

Wipers and washer fluid are simple parts that matter at tense moments: a sudden downpour, slush thrown up by a truck ahead, or low sun on a dirty windshield. A quick check each season keeps them ready.

How often to replace wiper blades

A common rule of thumb, cited by AAA and Firestone, is to replace wiper blades every 6 to 12 months. Climate shapes that range: high heat and strong sun can harden and crack the rubber, and freezing weather can leave it stiff and prone to cracking. Some automakers set their own interval. Tesla, for example, lists wiper blade replacement every year for the Model Y. Your owner's manual also lists the correct blade lengths.

Signs your blades are worn

• Streaks or smears left on the glass
• Skipping, where the blade misses patches of the windshield
• Chattering or screeching as the blade moves, which can also point to a bent arm or frame
• Rubber that is cracked, torn, rounded at the edge, stiff or pulling away from the frame
• Rust or corrosion on the arms or joints

Before replacing anything, clean the windshield and the blades. Dirt and wax residue can cause streaks on their own. If the blades still streak on clean glass, they're worn out. Replace them in pairs, since both have faced the same weather.

Winter wiper blades

In snowy regions, winter blades with a rubber boot keep ice and snow from packing into the frame. They're heavier than standard blades, so Bridgestone suggests swapping back in spring to avoid extra strain on the wiper motor. In milder winters with mostly rain and light frost, Michelin says standard blades in good condition are usually enough.

Winter vs summer washer fluid

Washer fluid comes in several blends:

• Summer or bug-remover fluid adds cleaning agents for insects, tree sap and road grime. It may not be made for freezing weather, so check the label.
• Winter or de-icer fluid contains more methanol, which lowers its freezing point and helps loosen light frost and ice. The label lists its temperature rating.
• All-season fluid combines bug and grime cleaning with cold-weather protection.

Washer fluids are sold with freeze ratings anywhere from +32°F, for warm regions, to -40°F, for very cold ones. Choose a fluid rated for temperatures colder than you expect to see, and switch before the first frost. Pouring winter fluid into a tank of summer fluid dilutes it and raises its freezing point, so use up or drain the old fluid first.

Why plain water is a problem in freezing weather

Some owner's manuals accept plain water only when washer fluid isn't available, and they rule it out in cold weather. Mazda's manuals, for example, say to use only washer fluid with antifreeze protection in cold weather, warning that fluid without it can impair your view of the road. Water expands as it freezes, which can crack the reservoir or damage the lines and pump, and frozen lines mean no spray when you need it. Water and fluid without freeze protection can also freeze on cold glass and smear. Hard tap water may also leave mineral deposits that clog the system over time.

Don't substitute engine antifreeze, soapy water or vinegar mixes. Mazda, Kia and Honda manuals warn these can discolor or damage paint or harm the washer pump, and Kia notes that engine coolant can badly blur the windshield when sprayed.

Check the washer nozzles

Run the washers and watch where the spray lands. If it dribbles, sprays weakly or misses the windshield, work through these checks:

1. Check the fluid level in the reservoir first.
2. With the ignition on, press the washer control and listen for the pump's faint whir. Silence can mean a pump or fuse problem.
3. Look for dirt, mud or wax residue blocking the nozzle openings.
4. Look for cracked or loose hoses if fluid is leaking.

A shop can clear or replace clogged nozzles, and pump, fuse and wiring problems are a job for a mechanic.

Seasonal checklist

• Inspect the blades at each oil change or change of season.
• Replace both blades if they streak on clean glass.
• Switch to a winter-rated fluid before the first frost.
• Top off often in winter, since snowy, slushy roads use a lot of fluid.
• Test the spray after every refill.

Windshield snow covers and other seasonal accessories are in our Seasonal collection.

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