Why Isn't My Rear Windshield Wiper Fluid Coming Out?
A malfunctioning rear windshield wiper fluid sprayer can be incredibly frustrating, especially during inclement weather. This comprehensive guide will troubleshoot the common causes behind this problem, helping you get your rear window clean and your vision clear again.
Possible Reasons Your Rear Windshield Wiper Fluid Isn't Working:
Here's a breakdown of the most frequent culprits, along with solutions and preventative measures:
1. Empty Washer Fluid Reservoir:
This seems obvious, but it's the most common reason! Check your washer fluid reservoir (usually located under the hood). If it's empty, simply refill it with the appropriate washer fluid for your climate. For colder weather, you'll need a fluid designed to withstand freezing temperatures.
2. Clogged Nozzle:
Over time, debris like dirt, bugs, or even salt residue can clog the rear windshield washer nozzle. This prevents the fluid from spraying correctly.
- Solution: Carefully examine the nozzle. You might be able to dislodge the blockage with a small, thin pin or needle. Be gentle to avoid damaging the nozzle. If it's severely clogged, you might need to replace the nozzle itself. These are relatively inexpensive and easy to replace. Check your car's owner's manual for instructions or watch a YouTube video specific to your car model.
3. Frozen Washer Fluid Lines:
In colder climates, the washer fluid lines can freeze, especially if you haven't used winter-grade washer fluid. This prevents the fluid from reaching the nozzle.
- Solution: Let your car warm up in a garage or sheltered area to allow the lines to thaw. Never use hot water on the lines, as this could damage them. Once thawed, check your fluid reservoir and refill with winter-grade fluid if needed.
4. Faulty Washer Pump:
The pump is responsible for pushing the fluid through the lines to the nozzle. A malfunctioning pump is a more serious issue.
- Solution: This usually requires a mechanic's expertise. Listen carefully near the reservoir for the sound of the pump activating when you engage the rear wiper. If you don't hear anything, the pump is likely the problem. Replacing the pump is often a straightforward repair, but professional help might be necessary depending on your vehicle's design.
5. Blown Fuse:
The rear wiper system is controlled by a fuse. A blown fuse will prevent the pump from working.
- Solution: Check your vehicle's fuse box (consult your owner's manual for its location). Locate the fuse for the rear washer system and inspect it. A blown fuse will usually appear visibly damaged (burnt or broken filament). Replace it with a fuse of the same amperage rating.
6. Electrical Wiring Problems:
Sometimes, the problem lies in damaged or corroded wiring within the system. This can prevent the pump from receiving power.
- Solution: This is a more complex problem requiring the skills of an experienced mechanic or auto electrician. They will need to diagnose the wiring fault and perform the necessary repairs.
7. Low Fluid Level Sensor Malfunction:
Some vehicles have sensors that detect low fluid levels. A faulty sensor might prevent the system from operating even if there’s fluid in the reservoir.
- Solution: This requires specialized diagnostic tools. A mechanic should be able to test the sensor and determine if it's the culprit.
Preventative Maintenance:
- Regularly check your washer fluid levels.
- Use appropriate washer fluid for the season.
- Clean your nozzles periodically to prevent clogs.
- Avoid running the system dry, as this can damage the pump.
By systematically addressing these possibilities, you'll greatly increase your chances of restoring your rear windshield washer function. Remember to consult your owner's manual or a qualified mechanic if you are unsure about any repair procedures.
