How to Remove Rust From Air Conditioner Coils

Rust is a common problem for many homeowners. It can form on metal surfaces, mainly when they are in contact with salt water. If you live near the ocean or have an air conditioner that sits outside your house, there’s good chance rust has formed on it already. You may not be able to see it by looking at the coils, but if you look closely, the surface will appear reddish-brown and covered in spots of black grime.

How to Remove Rust From Air Conditioner Coils

The presence of rust decreases efficiency and shortens the lifespan of appliances like AC units. Luckily there are ways to remove rust from air conditioning coils to work better and last longer! This blog post will show you how to remove rust from air conditioner coils.

Step by Step Guide on How to Remove Rust From Air Conditioner Coils

Step One: Determine the Best Time to Repair the Rust on Your Ac.

If you live in a cooler environment, then spring or fall would be a good time as it is not as hot and humid. If you live in a hotter environment, then it would be better to do this repair during the winter months when it is cooler outside. Remember, the objective is to complete these repairs without causing damage or injury to yourself.

Step Two: Check and Make Sure That Your Ac System Is Turned Off and Cool.

Be sure that you have followed all instructions in the owner’s manual for turning off the power supply before performing any maintenance on your air conditioning system. If you are unsure, you can call your local service provider to find out how to turn off the power.

Step Three:  Using a Flat Head Screwdriver, Remove the Faceplate on Your Ac Unit.

If possible, do not use too much pressure or force as this may damage the screws and cause them to break away into the AC Unit. Once the screws are out, you should be able to turn the faceplate sideways. If you cannot remove or move the faceplate, you will need to use an AC grille remover tool.

Using a Flathead Screwdriver and Remove The Faceplate On Your AC Unit

This is a flat piece of metal with an L-shaped notch on one end that fits into brackets located against the sides of your AC unit. You should then twist your L-shaped tool to begin removing the screws holding the faceplate in place.

Step Four: Remove the Rust or Corrosion From Your Coils.

First, apply a little WD-40 to the coils and allow this to penetrate for about 20 minutes. This helps to loosen the rust particles so they can be more easily removed. Then, using a wire brush, gently remove all of the loose pieces of rust on each coil. If you are uncomfortable with using a wire brush, you can also use a rag to wipe the rust away.

After all of the loose pieces have been removed from your coils, now it is time to remove stubborn rust particles that still remain on your AC unit. If these particles are not removed, they will become dislodged and wedged into smaller areas or restricted areas of your AC unit. Again, this can lead to further issues and higher costs down the road if not removed.

You Can Check It Out to Install a Window Air Conditioner in a Pop Up Camper

Step Five: Remove the Rust Stains.

If you have some rust stains on your coils that are dark brown, red, or orange, you can use a product called Evapo-Rust to remove these. However, it is essential to note that this product may cause skin irritation for some people, so please take precautions when using it. First, pour a generous amount of the Evapo-Rust overall rust stains on your air conditioner coils.

Allow it to penetrate and start working for about an hour or two before removing it using a wet/dry shop vacuum. It is essential to thoroughly dry all areas, so you do not cause any other issues. If these stains are left on your AC, they may cause metal components to corrode and rust as well. You do not want this to happen as it will be a costly repair to fix further down the road.


Rust, corrosion, and debris can build up on your air conditioner coils. This causes the airflow to become restricted, which leads to higher energy bills and less efficient cooling. Therefore, it is essential to clean out any dirt or rust accumulation before they cause more damage.

We’ve put together a quick guide for removing rust from AC coils with some simple household items that are most likely already in your home! All you need is vinegar, baking soda, salt water, and dish soap- plus an old toothbrush if needed!

You may also want a vacuum cleaner handy as well since cleaning will leave behind dust particles afterward. The infomercial style of this article has shared information on how to remove rust from air conditioner coils.

Check it also – How to Add a Thermostat to a Window Air Conditioner .

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