The windshield washer reservoir tank is a part you'll be grateful to have in good condition when your windshield gets dirty or your view becomes obstructed. It stores the washer fluid used to clean your windshield, ensuring that dirt, bugs, mud, or salt can be removed quickly with the push of a button. Without it, your wipers alone might not keep the glass clear, especially during rainy, snowy, or dusty driving conditions.

The reservoir is typically made of durable plastic and is installed under the hood. Its exact location depends on the vehicle, but it's often near the engine bay and close to the fender. Many tanks are translucent, allowing you to check fluid levels easily without opening the cap.

A healthy washer reservoir tank is important for clear visibility in all weather conditions.

What Windshield Washer Reservoir Tanks Do

The washer reservoir tank works together with the washer pump to deliver cleaning fluid to your windshield. When you activate the windshield washer control on the combination switch, the pump draws fluid from the reservoir and sends it through hoses to the washer nozzles, usually located on the hood or wiper arms. The fluid sprays directly onto the windshield, where the wipers spread it evenly to loosen and remove grime.

Some vehicles also use the same reservoir to feed washer fluid to the rear windshield, while others have separate tanks depending on the model. High-end vehicles may share the same reservoir with headlight washers, but not all are designed this way.

By maintaining a steady supply of washer fluid, the reservoir helps keep your windshield clean and clear, improving visibility and reducing driving hazards.

How to Check the Fluid in Your Windshield Washer Reservoir Tank

It's quick and simple to check your washer fluid regularly to ensure it's at the correct level and in good condition. Open the hood and look for a plastic tank with a blue or black cap showing the windshield spray icon. If the tank is translucent, you can easily see the fluid level. If not, open the cap to check inside. Refill when necessary, but avoid overfilling to prevent spills. Always refill with proper windshield washer fluid instead of plain water—washer fluid is specially made to prevent freezing, clean thoroughly, and reduce streaking, particularly in cold conditions.

Maintenance

Maintaining your washer reservoir is simple but important to ensure long life and proper function:

・Use the correct fluid – Choose a windshield washer fluid formulated for your climate. Winter blends have antifreeze, while summer blends target bugs and grime.
・Clean the tank – Dirt and sediment can build up inside the reservoir over time. Flush it with warm water during a refill to maintain great performance.
・Inspect hoses and nozzles – Clogged lines can block fluid flow. Use a pin or compressed air to clear them.
・Check the cap – A missing or damaged cap can let dirt or debris get in, which can clog the pump or cause failure.

Signs to Replace Your Windshield Washer Reservoir Tank

Although washer reservoir tanks are built from strong plastic, they can still wear out or get damaged. Here are some common signs that indicate it's time for a replacement:

・Leaks or fluid loss – If the fluid drops quickly without use, there could be a crack or hole.
・Cracks or damage – Heat, vibration, or age can cause cracks that make the tank unreliable.
・Weak spray – When the nozzles spray unevenly or too weakly despite a full tank, the reservoir may not be supplying steady fluid to the pump.
・Low washer fluid warning light – Modern vehicles have sensors inside the reservoir. If the light stays on after refilling, the sensor or tank may be malfunctioning.
・Visible discoloration – Tanks that look cloudy, brittle, or discolored may be nearing the end of their lifespan.

How to Choose the Right Windshield Washer Reservoir Tank for Your Car

Aftermarket or OEM

When buying a replacement reservoir, you'll need to choose between OEM (original equipment manufacturer) and aftermarket options. OEM tanks are made by your automaker or authorized manufacturers for your vehicle and guarantee the perfect fit and performance. Aftermarket tanks, made by third-party companies, can be more affordable and widely available but vary in quality. OEM tanks are preferred if you want top reliability and exact compatibility.

Vehicle Compatibility

Washer tanks are not one-size-fits-all. Make sure to match the tank to your vehicle's make, model, and year. Some tanks include built-in pumps or sensors, while others are basic fluid reservoirs. When buying an aftermarket tank, consider its capacity, material quality, and ease of installation, as some are designed for simpler replacement.

Installation Considerations

Replacing a washer reservoir tank can be easy or moderately complex, depending on the car model. Generally, these steps apply:

・Disconnect the battery for safety.
・Locate and remove the old tank; this may require removing the wheel well liner or nearby components.
・Detach the pump and hoses, then set aside sensors, pumps, or caps you'll reuse.
・Install the new tank securely, reconnect all hoses, wiring, and the pump.
・Fill with washer fluid and test the spray to ensure everything works properly.

Where to Buy Quality New and Used Windshield Washer Reservoir Tanks

Replacement washer reservoir tanks are widely available from Auto Parts retailers, dealerships, and online sellers. Used tanks can be a cheaper option or helpful if OEM tanks are out of production, though they may not last as long as new ones. You can find used windshield washer reservoir tanks in good condition and at great prices here at BE FORWARD Auto Parts.