Used Car Windshield and Wiper Test Before You Buy

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Clear visibility matters in ordinary rain and road spray. Test the wipers and washer system while parked, inspect the driver’s view through the glass, and ask a professional to assess any crack, leak or poor wiping before agreeing to buy.

Inspect the driver’s field of view

Look across the windshield from the driver’s seat for cracks, chips, severe pitting or distortion in the viewing area. A small mark may still spread or affect visibility; ask a qualified glass professional about repairability and local inspection rules.

Run every wiper speed

Test intermittent, low and high settings, plus the washer function. Watch for missed areas, skipping, chatter or an arm that moves unevenly. Keep hands clear of the wiper mechanism while it operates.

Check blade edges and arms

Look for torn or hardened rubber, loose arms and signs of poor fit. A new blade may be a simple maintenance item, but bent arms or a recurring failure need a proper diagnosis.

Test defogging controls

Confirm that the front defroster directs airflow to the windshield and that the rear-window defogger responds. If visibility features fail, document the symptom and request an estimate.

Record glass work and repairs

Ask whether the windshield has been replaced and request the invoice if available. For vehicles with cameras or sensors attached to the glass, ask the manufacturer or qualified repairer whether any post-replacement procedures are required for that exact vehicle.

Frequently asked questions

Can I assess wipers on a dry windshield?

Use the washer function as intended; dry operation alone may not show the full pattern.

Is every windshield chip an automatic rejection?

No. Have a glass professional assess location, size, visibility impact and local rules.

Can I ignore a rear defogger that does not work?

No. Record the defect and include the repair in your decision and budget.