How to remove rust from an evaporative cooler (7 Easy Ways)

An evaporative cooler is a machine that works by removing water in the house. The water they release is the one that causes the rust on their surfaces.   The rust forms when the evaporative cooler drains away all the water from the house, after which it can remain on the cooler, causing the rust. Most manufactures try hard to make the evaporative coolers in a design that they cannot rust, but it is not working that the coolers still have rusts that can develop into small leaks. When having such rusts from the evaporative cooler, it is good to remove the rust to avoid more significant damages.

Before identifying rust in the evaporative cooler, you need to check the more excellent more frequently. After reviewing the cooler, you can now know if it has rust or not. Therefore, if you find out that it has rust, consider finding a way of removing the rust from the cooler surfaces. Rusts are a layer of corrosion that forms on the covers of metals that can lead to leaks in the metals. So when you have rust in your evaporative cooler, it can cause leaks that the cooler can fail to work correctly. The best way to remove the rust is by checking the cooler and fixing the problem fast.

The article below shows the possible ways of removing rust from an evaporative cooler since rust can cause more damages to the cooler. After the possible ways, I will give you the causes of the rust on the cooler so that you can try preventing the cooler from rusting by getting away with the reasons after that are the frequently asked questions and the conclusion which has the content on the whole article.

Causes of rust on the evaporative cooler

Most people ask about the major causes of rust on the evaporative cooler to know what to correct to prevent rusting.  When you know the exact cause of a problem, you can quickly learn how to solve it.  Some of the minor signs of rust are superficial stains that you can easily see in your cooler. But if the rust becomes worse, the symptoms can be leaks from the cooler. Some of the causes of the rust are as follows:

·        High humidity in the house.

In most cases, the primary cause of rust is humidity, where areas with high humidity cause rust to develop on devices very fast. Rust in the evaporative cooler results from the humid air that flows through the cooler surfaces and inside some of its parts. Typically, metals will always rust when the area has high humidity, even if the cooler metals are stainless steel. The rust in the cooler can be stains that form on the surfaces, which are brown, which shows that the rust is beginning to show up. Rust is always the effect of water on some metals that they react by oxidizing.

·        Minerals in the water passing through the cooler.

Water is natural but contains some nutrients that can help the body which passes through the coolers. It has some minerals such as calcium and magnesium, which are alkaline deposits. The minerals in water are the ones that stick on its surface, such as cooling pads that then form rust after some time of resting on the covers. Therefore, you must keep checking the surfaces and other interior parts of the cooler to remove the deposits in the cooler. Failure to remove the residues on the cooler later causes rust on the evaporative cooler.

·        Dirty surfaces of the evaporative cooler.

The evaporative cooler can have dirty particles that accumulate on the cooling pads and other surfaces. Tainted particles like dust can cause rust on the surfaces they are resting on. Therefore, you must keep checking the evaporative cooler and remove the harmful particles to prevent rust from developing on the cooler’s surfaces.

How to remove the rust from the evaporative cooler

Due to some reasons that can cause the rust to develop on the evaporative cooler, it is good to consider removing the rust from the device to help it work efficiently since the cooler helps in keeping the environment and the other surroundings cool without adding more electricity bills to the individual. The best way to prevent rust from the evaporative cooler is by following the routine of maintaining the evaporative cooler by following the practices like cleaning the cooler to prevent such occurrences from developing.

However, since we have the problem at our hands, let’s consider finding ways to solve the problem. Below are the steps you can follow to help remove the rust from the evaporative cooler.

    i.            Gather all the steps you can follow to help remove the rust from the evaporative cooler.ving the probe requirements you need to remove the rust.

 Before trying to do anything on the evaporative cooler, consider collecting all the requirements you need for the process. The detergents to remove the rust depend on your preference and what you think you can consider using. Some requirements include rubber gloves to put on the hands while handling the rust in the cooler, a brush to brush off the rust, water, bleaching agent, sandpaper, sponges, vinegar, baking soda, lemon juice, and other things you’ll need.

  ii.            Switch off the evaporative cooler.

 After collecting the requirements you need, consider getting to your evaporative cooler. Would you please switch off the evaporative cooler by unplugging all the power cables from it and the switch? Ensure you protect yourself using specific requirements like the antistatic band wrist that prevents injuries from the electricity. You can also turn off the water supply for the cooler and the exit point of the water from the cooler. You can then remove the cooler pads and other interior parts like the panels.

  iii.            Ensure you spray water to the cooler.

Consider spraying the water to the evaporative cooler using the garden hose, which has a sprayer with it to all the areas of the cooler. Ensure the water gets into all the parts of the cooler, including its interior features, so that you can remove the dirt, debris, dust, and other dirt particles that accumulate on the surfaces of the cooler. It is good to use a spray since it sprinkles water carefully to the parts and can remove dirt without many struggles.

  iv.            Add rust solution to the cooler using the spray.

Add water to the spray, then put the rust cleaning solution on the rush. Spray the cooler using the rust cleaning solution carefully by paying attention to the central parts like the cooling pads, the metal areas of the cooler, and some interior features. Spray quiet for some time in the cooler to ensure every aspect gets enough rust cleaning solution. The answer is sometimes on the cooler so that it gets to work with it.

If the evaporative cooler has more stains that seem to stay for long, you can use the paint scraper and gently work on the rust to help lift them from the cooler. You either use sandpaper, brush, or any other material for brushing the more excellent surfaces to remove the rust. A meeting is suitable for use when rubbing the internal surfaces of the cooler to remove the rust. Gently work with the cooler to avoid over scrubbing that can leave marks on the characters.

Sometimes, an individual may need to use natural cleaning solutions to remove the rust from their coolers. They can decide to use baking soda and vinegar, where they have to measure a certain amount of ratio so that the solutions work well. When using baking soda and vinegar, consider using a ratio of one to three to remove the rust effectively. First, add vinegar to a bottle and add baking soda and give them time to mix well before applying to the cooler.

  v.            Rinse the evaporative cooler.

  After using the cleaning solution in the evaporative cooler, rinse off the cooler using water by spraying the hose, which removes the dirty particles after scrubbing. The one cleaning solution bleaches them. Using a piece of cloth, wipe the cooler gently to dry all the water and check the cooler properly to ensure everything is clean. Give the cooler some time to dry.

  vi.             Repair and replace parts with damages.

  If the cooler has strong stains, the possibility of having leaks is very high that it can cause damage to the cooler. Therefore, after removing rust, check all the parts with the cooler to repair any panel that leaks or replaces them if possible. To improve, consider using the epoxy mix that works with plastic surfaces and mix it since they work by applying them on a surface. Apply the epoxy to the damaged parts using a small paintbrush and let the epoxy work for some time.

vii.            Sand down the epoxy.

After drying the epoxy for some time, sand it down using sandpaper or a sanding block. Wipe away the remaining dirty particles or debris and sand using a sponge or a piece of cloth. After doing this then you are good to work with the evaporative cooler.

Maintenance practices of the cooler to prevent rust

·        Check over the system frequently.

When needing to use the system, consider checking some of its parts every time before you choose to use it. Inspect all the external and internal components of the system to check the condition of the machine. Check if the system has any dirty particles and remove them immediately.

·        Use quality cooling pads.

The quality of pads for use with the cooling machine determines the process of rust and the types of dirt that accumulate into it. If the pads you are using are not working well with the cooling system, consider changing them and use quality pads for better working and reduce rusting rates.

·        Get a good store for the evaporative cooler.

 After using the evaporative cooler, clean it and give it time to dry. If the cooler is completely dry, it cannot grow molds or other bacteria that it cannot rust anymore. After cleaning, get a good place where it cannot get in touch with moisture that causes it to rust. Store it in a calm place until you want to use it.

Frequently asked question

1.     After how long must you clean the evaporative cooler?

After how long you must clean the evaporative cooler depends on the number of times you are using the cooler. If you are using the cooler days, it is good to clean the cooler at least once a month to prevent the accumulation of dirt inside the cooler. Consider using the cleaning solution or bleaching solution to remove the rust.


Rust developing in the evaporative cooler can cause some damages like leaks and failure of the cooler to work. Therefore, if the cooler has rust in it, consider cleaning the rust as soon as you notice the stains in the cooler by cleaning. There are steps above that you can follow when cleaning the evaporative cooler. The article contains causes of rust in coolers, steps to follow when removing rust, and the maintenance practices.

Finally, consider following the maintenance practices of the evaporative cooler to reduce the chances of rusting of the cooler, like cleaning the cooler more frequently. You can also choose to repair the parts with damages to the cooler to help the cooler work effectively.

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