Need Assistance? Live Chat

Select by Brand

Get Email Exclusives

Sign up for email updates on the latest exclusive offers

Mercedes Benz E420 Washer Reservoir

Common Mercedes Benz E420 Washer Reservoir Problems and Their Causes

Driving with your classy Mercedes Benz E420 is always an adventure-you don't know what's going to happen, but you still look forward to the thrill. Whatever it is that you might encounter, whether a sudden snowfall or a pesky sandstorm, your Mercedes Benz is strongly built to get you to your destination. One of this vehicle's best assets is its windshield washer reservoir. It is capable of storing a considerable amount of fluid, which is enough to keep your Mercedes Benz's windshield clean and clear as long as you're on the road. But sometimes, extreme weather changes and excessive use speeds up your fluid tank's decline. For your awareness, here are the top problems encountered by Mercedes Benz washer reservoir and the common reasons behind them:

Cracks and other physical damage

If your windshield washer fails to squirt water out from the nozzles or if you hear the pump trying so hard to get the washer fluid out, your washer reservoir is probably empty because of a leakage problem. Although your Mercedes Benz E420 washer reservoir is made from sturdy ABS plastic, which is highly resistant to oxidation and corrosion, it is still prone to developing surface cracks. When these hairline cracks worsen, they will eventually lead to windshield washer fluid leaks. Cracks and other surface deformities are usually obtained from low- to high-intensity impacts. They can also be acquired after the windshield washer fluid freezes inside the tank since plastic becomes brittle when subjected to extremely low temperature. Generally, plastic tanks with cracks can still be repaired. But if you have some extra bucks to spare, it is recommended to just replace your broken stock.

Faulty washer reservoir cap and cap seal

You are already certain that your washer reservoir's body is free from cracks, and yet the windshield washer fluid still magically disappears-if you are experiencing this problem, you may want to check the cap of your washer tank or the cap's rubber seal. When these windshield washer tank components wear out or fail after some time, they can cause the fluid inside the tank to evaporate. If a tiny pinhole can drain the tank overnight, a small gap or crack in the cap or a torn rubber cap seal can cause a washer fluid-filled reservoir to become empty in days. Unfortunately, a damaged cap or rubber seal can no longer be repaired. When these things fail, the only option is to have them replaced.

Other troubleshooting tips

If the reservoir and its cap are fine, and yet your washer still refuses to produce the windshield cleaning fluid, the problem might be the tubes and the nozzles. If these windshield washer components get clogged because of dirt and wax accumulation, they can also cause the washer to malfunction. To solve this problem, you can opt to replace the tubes with new ones. But if your budget is tight, flushing the tubes and the nozzles to remove the unwanted debris can also do the trick.

Mercedes Benz E420 Washer Reservoir Bestsellers View more

Mercedes Benz E420 Washer Reservoir Available Years

  • Secrets to a Well-maintained Mercedes Benz E420 Washer Reservoir 27 February 2013

    Your Mercedes Benz E420's elegant look will be put to waste if its windshield is filthy. Good thing it is equipped with a portable cleaner in the form of its dependable windshield washer. The cleaning fluid is stored in the washer assembly's reservoir, which is usually made of plastic. This material is built to withstand the normal conditions within the engine block, but over time, probably due to excessive use and other factors, the plastic washer tank and its components wear out. Although this washer tank breakdown may seem inevitable, you can actually do something to prevent it from happening. Here are some of the most effective secrets in keeping your Mercedes Benz E420 washer reservoir in good shape:


    Keep your washer reservoir winter-ready.

    Cracks on the surface of your Mercedes Benz's washer reservoir are often caused by frozen water or washer fluid inside the tank. Since plastic materials easily break in low temperature, letting the water freeze inside the washer reservoir absolutely speeds up its retirement. To avoid this, you must NEVER fill your reservoir with pure water. It is highly recommended to use appropriate windshield washer solutions because they are formulated to resist freezing, especially during winter. These windshield cleaners are very cheap, and they can be bought even in your local grocery stores. But if you don't want to spend your hard-earned bucks, you can formulate your own home-made windshield cleaner with water and vinegar. You can also combine water with a cup of glass cleaner and isopropyl alcohol if you can't stand the smell of vinegar.


    Perform regular check-ups on the washer reservoir and its components.

    Damage on the washer reservoir and its components can easily be prevented through habitual checks and tests. Examining the tank's body, its cap, and the cap's rubber seal at least every three months will allow you to repair the tiny cracks before they get worse. You will also have the chance to replace the cap and its seal if they are damaged even before they cause serious leakage problems. Removing the washer reservoir from the engine block is advisable so that you can check all the components more thoroughly.


    Keep the tank, tubes, and nozzles clean and clog-free.

    Cleaning the windshield washer assembly is highly recommended to avoid corrosion and damage caused by dirt and other contaminants. The washer reservoir needs to be flushed from time to time, so the unnecessary rubbles will be removed from its interior. Aside from the tank's body, the tubes and the nozzles also require flushing and cleaning. The debris from the tank's interior may have been pumped into the tubes, and it can only be removed by flushing or total tube replacement. As for the nozzles, wax residues from car wash and other maintenance rituals may cause them to clog, which can certainly prevent the washer fluid from coming out. Cleaning the nozzles regularly with soap and water can solve this clogging dilemma.