A windshield washer pump may stop working due to several reasons:
1. **Electrical Issues**: A blown fuse, faulty relay, or damaged wiring can interrupt the electrical supply to the pump, preventing it from functioning.
2. **Pump Failure**: The pump motor itself may fail due to wear and tear, overheating, or manufacturing defects, leading to a complete breakdown.
3. **Clogged Nozzles or Lines**: Dirt, debris, or frozen washer fluid can clog the nozzles or lines, causing the pump to work harder or stop functioning altogether.
4. **Empty Washer Fluid Reservoir**: If the reservoir is empty, the pump will run dry, which can lead to overheating and eventual failure.
5. **Faulty Washer Switch**: A malfunctioning switch on the steering column or dashboard can prevent the pump from receiving the activation signal.
6. **Reservoir or Hose Leaks**: Cracks or holes in the reservoir or hoses can lead to fluid leaks, reducing pressure and causing the pump to fail.
7. **Corroded or Loose Connections**: Corrosion or loose connections at the pump terminals can disrupt the electrical flow, preventing the pump from operating.
8. **Frozen Washer Fluid**: In cold weather, the washer fluid can freeze, blocking the flow and potentially damaging the pump.
9. **Mechanical Obstructions**: Physical obstructions or damage to the pump mechanism can impede its operation.
10. **Incorrect Fluid Use**: Using non-recommended fluids can cause deposits or damage to the pump and associated components.
Regular maintenance, such as checking fluid levels, inspecting for leaks, and ensuring electrical connections are secure, can help prevent these issues.