Symptoms
- Windshield spray stopped working after topping off with the wrong liquid
- Spray looks oily or discolored
- Reservoir cap is unlabeled and something else was poured in by mistake
Likely causes
- CommonPlain water used instead of washer fluidWater alone can freeze in the lines and pump during cold weather, cracking components.
- PossibleCoolant or oil accidentally poured into the wrong reservoirReservoirs are sometimes similar in appearance under the hood, especially in low light.
- CommonWrong washer fluid dilution used in winterFluid rated for summer use isn't strong enough to resist freezing in cold climates.
What to do
- Open the hood and confirm which reservoir was actually filled; washer fluid reservoirs usually have a windshield-and-spray icon on the cap.
- If it was just water, drain what you can and refill with proper washer fluid rated for your climate.
- If it was any oil-based fluid like coolant or motor oil, do not run the washer pump; that fluid needs to be drained and the reservoir flushed with washer fluid before use.
- Check that the spray nozzles aren't clogged by testing the washer function after refilling.
- In freezing climates, always use a washer fluid rated below your area's lowest expected temperature.
- Label reservoirs with a permanent marker if the caps are hard to tell apart on your specific car.
Tools and parts
- Funnel
Windshield washer fluid, freeze-rated for your climateSearch: “washer fluid winter rated”
When to call a pro
If the washer pump won't spray at all after a proper refill, or you smell oil at the nozzles, have a shop check the pump and lines for contamination.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.