Common symptoms include no spray or weak spray when you activate the washer, a buzzing or humming noise from the reservoir area, spray that is uneven or stops unexpectedly, and visible leaks near the pump. If you notice these signs, the washer pump is a likely culprit and merits inspection.
Common symptoms
The following sections outline the most frequently reported signs that the windshield washer pump may be failing. Look for these patterns to guide diagnosis.
No spray or weak spray
- No fluid is emitted when you pull the stalk or press the washer switch, even if the reservoir is full.
- The spray is very weak, or the stream stops after a moment and then may fail again.
- The spray pattern is irregular, with droplets hitting unrelated areas rather than the entire windshield.
When there is no spray or only a weak stream, the pump, its electrical supply, or the drive lines could be compromised, or the lines may be clogged.
Noise, leaks, or erratic operation
These audible and physical indicators help distinguish pump problems from simple nozzle or fluid issues.
- You can hear a buzzing, humming, or grinding sound from the pump area when activating the washer, but little or no fluid is sprayed.
- Fluid leaks around the pump, reservoir, or hose fittings indicate a seal failure or damaged tubing.
- The washers work only intermittently or stop and start unpredictably, which can point to wiring or connection issues.
Audible symptoms or leaks typically point to a failing motor, damaged seals, or loose connections rather than a simple reservoir issue.
Electrical checks and quick checks
Electrical issues are common culprits and can mimic or mask pump failure. Start with these quick checks before replacing parts.
- Check the windshield washer fuse in the vehicle’s fuse box and replace if blown.
- Inspect the relay and wiring to the pump for corrosion, damaged insulation, or loose pins.
- Inspect the pump connector for dirt or corrosion; reseat or clean as needed; if the pump still doesn’t run, the pump may be faulty.
Electrical problems are often resolved by replacing a blown fuse or faulty relay, but persistent issues after these checks suggest the pump or its wiring may need attention.
What to do next
If symptoms persist after basic checks, consider replacing the pump or seeking a professional diagnosis. A technician can verify the pump operation, test the fuse/relays, inspect wiring, and check for blockages in the lines or leaks in fittings.
Summary
In short, watch for no spray or weak spray, unusual noises, leaks, or erratic operation. Start with basic electrical checks (fuses, relays, wiring), then inspect for blockages or leaks, and replace the pump if necessary. Regular maintenance and keeping the reservoir topped up can help prevent some pump-related issues.