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RV Air Conditioner Leaks When It Rains

February 20, 2024 | Victor Lukasso

RV air conditioner leaks can be a frustrating and costly problem for recreational vehicle owners.

A leaking air conditioner could be mistaken for a leaking roof, especially when it’s your first experience.

When an RV air conditioner leaks during a rainstorm, it can cause water damage to the interior of the vehicle and potentially lead to mold and mildew growth.

There are several reasons why an RV air conditioner might leak when it rains.

  1. Damaged or corroded AC parts
  2. Clogged Drainage system
  3. Missing or loosed bolts
  4. Misaligned Air Conditioner
  5. Problematic rubber gasket
  6. Corroded or weak roofing

Other factors might contribute to a leaking air conditioner during a downpour.

You can contact an HVAC technician for inspection and fix if you feel the issue is complex.

Nonetheless, I’ll provide you with actionable tips you can employ to fix a leaking RV air conditioner.

Causes of RV Air Conditioner Leaks When raining

Here’s a detailed explanation of how the above-listed reasons contribute to a leaking RV air conditioner.

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1. Corroded or Damaged AC Parts

If the air conditioner is damaged or has corroded parts, it may leak water when it rains.

This is most feasible if the RV has been parked unused for a long time, accumulating dust and corrosion.

This will make the components weak and might create potholes where water can access the vehicle’s interior.

2. Clogged Drain Line

The air conditioner has a drain pipe that carries away excess moisture, and if this pipe becomes blocked or damaged, it can cause water to leak into the RV.

3. Missing or loosed Bolt

If the air conditioner installation bolts are loose or missing, it’ll give passage for water to leak into the RV.

You can confirm if your bolts are intact by climbing to the rooftop and visually inspecting the air conditioner unit.

4. Misaligned Air Conditioner

If the air conditioner is not properly aligned with the roof of the RV, it can cause water to leak into the vehicle.

5. Problematic Rubber Gasket

The main function of the rubber gasket is to seal the air conditioner from water leaks. If the gasket is too compressed or cracked, you should expect leaks when it rains.

6. Weak or Corroded Roofing

As I said earlier, a leaking roof can be mistaken for a leaking air conditioner, so it’s time to inspect your RV roofing after you’ve evaluated the above causes and none is the culprit.

Climb to the top of the roof and look out for cracks or openings that water might use to gain entrance into the RV.

Also, If the air conditioner is too large for the RV, it may put too much stress on the roof and cause leaks.

If you’re having problems diagnosing the cause of the RV air conditioner leaks, you should seek a technician’s attention.

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Repairing an RV Air Conditioner Leak

If your RV air conditioner is already leaking, there are steps you can take to repair it.

1. Seal any Cracks or Holes

If there’s a case of cracks or openings in your RV’s roof, you can use a sealant to seal it and prevent further water leakage.

2. Replace faulty parts

If any part has been damaged, probably due to corrosion, clogged, or physical impact.

Do well to replace them with suitable parts for your RV.

3. Re-level the Air conditioner Unit

If the air conditioner is not properly aligned with the RV’s roof, it can cause leaks. If so, you may need a professional to re-align the unit to fix the leak.

4. Tighten the Mounting Bolts

If it’s a case where the mounting bolts are loose, then you should try tightening them to prevent further water leakage.

5. Replace the Air Conditioner

If the air conditioner has been serving for a long time or has been damaged extensively, you should get a replacement as soon as possible.

Also, you might consider a replacement if the air conditioner is incompatible with the RV.

Preventing RV Air Conditioner Leaks

It’s important to perform regular maintenance and inspections to prevent leaks in your RV air conditioner.

Here are some steps you can take:

1. Clean the Air conditioner regularly

Particles such as dust, debris, and moisture could reduce the air conditioner’s efficiency.

Regular clean-ups will keep the air conditioner running smoothly and improve its lifespan.

2. Check the Rubber gasket and seals

Endeavor to check the rubber gasket and seals for any cracks, wear out, or damage.

This will help you fix it quickly before it becomes extensive damage.

3. Check the drain line

Make sure the drainage pipe is clear and in good condition.

4. Use a Cover

Consider using a cover or casing to protect the air conditioner from dust, moisture, and dirt when it is not in use.

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This will help avert damages that might occur due to weather conditions.

5. Perform regular maintenance and inspections

Have a professional inspect your air conditioner at least once a year to check for any issues that may cause leaks.

Minimizing Water Damage in the Event of a Leak

If you experience a leak in your RV air conditioner, you can take steps to minimize the water damage.

  • Cover the air conditioner with a waterproof material
  • Move the RV to a garage or park until the cause of the leak is identified and fixed
  • Quickly remove the water inside the RV using a mop or vacuum.

Alternatives to Traditional RV Air Conditioners

If you are tired of dealing with leaks in your RV air conditioner, you may want to consider alternative cooling options.

Here are a few options to consider:

Portable air conditioners Rooftop vent fans Window air conditioners
Portable air conditioners can be a good option for RVs, as they can be easily moved from room to room and do not require installation.

However, they require access to an electrical outlet, and some models can be heavy and difficult to move.

Rooftop vent fans can help to circulate air and keep your RV cool, and they do not require installation.

However, they do not provide as much cooling power as a traditional air conditioner and may be ineffective in extremely hot or humid conditions.

Window air conditioners can be a good option for RVs with roof-like covers, as they can be easily installed in a window and do not require any permanent modifications to the RV.

However, they may not be suitable for all RVs and can be noisy and too big.


Why is my AC leaking when it rains?

There are several reasons why an air conditioner (AC) might leak when it rains. Some possible causes include faulty seals, faulty drain lines, damaged or corroded ac units, and loose mounting bolts.

Why Is My RV AC leaking water outside?

Your RV AC is leaking water outside because of an incorrect installation; endeavor to seek the attention of a professional HVAC technician for this task.

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Meet Victor Lukasso, the owner of V. Auto Basics. Through this blog, Victor Provides Insights on the latest tips, maintenance, repair, and techniques in the automotive world.