How to Clean RV AC Coils? A Guide to Cooler Adventures

Cleaning your RV AC coils is essential for maintaining efficient cooling, preventing costly repairs, and ensuring comfortable travels. By removing dirt, debris, and mold, you improve airflow, optimize performance, and extend the lifespan of your RV’s air conditioning system.

The Importance of Clean RV AC Coils

RV air conditioners work tirelessly to keep you cool during hot summer months. However, the condenser and evaporator coils—critical components responsible for heat exchange—can easily become clogged with dust, pollen, insects, and other environmental debris. This buildup restricts airflow, forcing the AC unit to work harder, which significantly reduces its cooling efficiency. A dirty AC unit also consumes more energy, leading to higher electricity bills if you’re plugged into shore power or increased generator usage if you’re boondocking. Furthermore, accumulated moisture and debris can create a breeding ground for mold and mildew, potentially impacting air quality and causing unpleasant odors. Neglecting this crucial maintenance task can ultimately lead to premature failure of the AC unit, resulting in expensive repairs or even a complete replacement.

Tools and Materials You’ll Need

Before you begin cleaning, gather the necessary tools and materials. This proactive step will save you time and ensure you have everything on hand to complete the task efficiently.

• Screwdriver: To remove the AC shroud.
• Soft-bristled brush: Ideal for gently removing loose debris. A fin comb is specifically designed for straightening bent fins.
• Vacuum cleaner with brush attachment: To suck up loose dirt and debris after brushing. A shop vac is generally preferred due to its power.
• AC coil cleaner: A specialized cleaner designed to dissolve grime and mold. Look for a non-acidic and self-rinsing formula. Avoid using harsh chemicals like bleach, as they can damage the coils.
• Spray bottle: To apply the AC coil cleaner.
• Safety glasses and gloves: To protect your eyes and skin from the cleaner.
• Water hose with a gentle spray nozzle (optional): For rinsing, but only if recommended by your AC unit’s manufacturer and if you have access to a drain or open area to avoid water damage.

Step-by-Step Cleaning Process

Follow these steps carefully to ensure you thoroughly clean your RV AC coils without damaging the unit.

1. Disconnect Power: The most important step! Always disconnect your RV from shore power and turn off the generator. Locate the breaker for the AC unit and switch it off for added safety.
2. Remove the AC Shroud: Using a screwdriver, remove the screws that hold the AC shroud in place. Carefully lift the shroud off the unit and set it aside.
3. Inspect the Coils: Take a close look at both the condenser and evaporator coils. Note the amount of dirt, debris, and any signs of mold growth.
4. Brush Away Loose Debris: Using a soft-bristled brush or fin comb, gently brush away any loose dirt, leaves, insects, or other debris from the coils. Be careful not to bend or damage the delicate fins. Work in the direction of the fins to avoid further bending.
5. Vacuum the Coils: Use a vacuum cleaner with a brush attachment to suck up any remaining loose dirt and debris.
6. Apply AC Coil Cleaner: Spray the AC coil cleaner liberally onto the coils, following the manufacturer’s instructions. Ensure the cleaner covers all areas of the coils. Allow the cleaner to sit for the recommended time, usually 10-15 minutes, allowing it to dissolve the grime and mold. Self-rinsing cleaners are ideal for RVs as they eliminate the need for water rinsing, which can be difficult on a roof.
7. Rinse (Optional, Manufacturer Permitting): If your AC unit’s manufacturer recommends rinsing and you have a way to safely drain the water away from the roof and into a suitable location, gently rinse the coils with a water hose using a gentle spray nozzle. Avoid using high pressure, as this can damage the fins. Be extremely careful not to get water into any electrical components.
8. Inspect Again: After cleaning, inspect the coils again to ensure all dirt and debris have been removed. If necessary, repeat steps 4-7.
9. Reassemble the Unit: Once the coils are clean and dry (if rinsed), carefully replace the AC shroud and secure it with the screws.
10. Reconnect Power: Reconnect your RV to shore power or turn on the generator. Switch the AC unit’s breaker back on.
11. Test the AC: Turn on the AC unit and check to see if it is cooling properly. You should notice an immediate improvement in airflow and cooling efficiency.

Cleaning Frequency

Ideally, you should clean your RV AC coils at least twice a year: once before the start of the cooling season (spring) and once at the end (fall). If you frequently travel in dusty or pollen-heavy environments, you may need to clean the coils more often. Regular inspections of the coils will help you determine the best cleaning frequency for your specific needs.

Troubleshooting Common Issues

If you encounter any problems during or after cleaning your RV AC coils, such as reduced cooling efficiency or strange noises, consult the troubleshooting section of your AC unit’s owner’s manual or contact a qualified RV technician.

Frequently Asked Questions (FAQs)

1. Can I use household cleaners on my RV AC coils?

No, it’s strongly discouraged. Household cleaners, especially those containing bleach or ammonia, can corrode the aluminum coils and damage the unit. Always use a specifically formulated AC coil cleaner that is non-acidic and safe for aluminum.

2. How do I know if my RV AC coils need cleaning?

Signs that your RV AC coils need cleaning include reduced cooling efficiency, weak airflow, unusual noises from the unit, increased energy consumption, and a visible buildup of dirt and debris on the coils.

3. What is a fin comb and how do I use it?

A fin comb is a specialized tool designed to straighten bent or damaged fins on the AC coils. Gently run the comb along the fins in the direction they should be, carefully straightening them. This improves airflow and cooling efficiency.

4. Can I hire someone to clean my RV AC coils?

Yes, you can hire a qualified RV technician to clean your AC coils. This is a good option if you are uncomfortable performing the task yourself or if you suspect there may be other underlying issues with your AC unit.

5. Is it safe to clean the AC coils myself?

Yes, it is generally safe to clean the AC coils yourself, provided you follow the safety precautions outlined above, including disconnecting power and using appropriate protective gear. If you are unsure about any part of the process, consult a professional.

6. What happens if I don’t clean my RV AC coils?

Neglecting to clean your RV AC coils can lead to reduced cooling efficiency, increased energy consumption, premature failure of the AC unit, and potential health problems due to mold and mildew growth.

7. Can I use a pressure washer to clean the coils?

No, never use a pressure washer to clean your RV AC coils. The high pressure can easily damage the delicate fins and other components of the unit.

8. How long does it take to clean RV AC coils?

The cleaning process typically takes between 30 minutes to an hour, depending on the amount of dirt and debris buildup and your experience level.

9. Do I need to clean both the inside and outside coils?

This guide focuses on cleaning the outside (condenser) coils which are most exposed to the elements. Cleaning the inside (evaporator) coil typically requires professional assistance and involves removing interior components. Consult your RV’s service manual.

10. My AC unit is making a loud humming noise after cleaning. What could be the problem?

A loud humming noise could indicate a problem with the compressor or fan motor. Check to ensure the fan is spinning freely and there are no obstructions. If the noise persists, consult a qualified RV technician.

11. Can cleaning the AC coils improve the air quality inside my RV?

Yes, cleaning the AC coils can significantly improve the air quality inside your RV by removing mold, mildew, and other allergens that can accumulate on the coils.

12. What is the best time of day to clean my RV AC coils?

Choose a cool, overcast day or early morning to clean your RV AC coils. Avoid cleaning in direct sunlight, as the cleaner may evaporate too quickly and reduce its effectiveness.