RV Air Conditioner Dripping Water Outside

RVs frequently experience a leaking air conditioner, primarily when the AC operates nonstop. While you can experience some condensation, when you see it on a newly installed air conditioner, it could be the cause of some worry.

Because of this, it is better to know why is my RV AC dripping water inside before making any repairs. Besides this, you can find some leak when it rains compared to only when the AC is in use.

If you have easy access to the air conditioner, fixing this problem might not be difficult. However, it’s difficult to tell whether an air conditioner is to blame for water leaks that occur when it rains or whether a leaking roof is to blame, and you need some overdue RV maintenance. RV air conditioners frequently leak water from gasket breaches or debris buildup on drain pans.

In our guide, you can learn many reasons your RV air conditioner leaks. By the end, you’ll be able to see why you have water leak issues, and you’ll find your camper AC leaking water inside.

You’ll also learn that an RV that isn’t level could cause RV air conditioner condensation inside your unit to run in the wrong direction; thus, RV AC leaking inside your camper. (Read Fifth Wheel To Bumper Pull Adapter Guide)

RV Air Conditioner

Why My RV Air Conditioner Leaks?

Here you can find the main reasons your air conditioning unit has water dripping inside.

The drain pan is not draining properly.

One of the most frequent reasons for RV air conditioner water leaking issues is a drain pan that can’t drain the water flow. It could be the trailer is not level, so the water can’t reach the drain, or the drain hole is clogged.

Here, the pipe should ideally drain the water from the roof-mounted condenser coil rather than causing water leakage into your RV.

This may be caused by dirt or debris on the evaporator coils, dirt obstructing the drain holes or purposeful sealing.

Some people who try fixing water leaks end up sealing the drain holes accidentally, which can worsen the issue, and water drips from the air conditioner inside.

The water collects in the drain pan where the evaporator coil is and flows onto the roof through tiny holes.

The drain pan’s primary purpose is to remove moisture that accumulates on the evaporator coil and the evaporator cover.

The evaporator coils get cold when the air conditioner is turned on inside the RV.

Cold air is forced into the RV as the process removes damp air from the inside. Heat is transferred as a result, and the evaporator collects water that is then transported to a drain pan to push it off the roof.

evaporator coil

How to Clean the evaporator coils:

If you discover that the evaporator coils are dirty, use a cleaning indicated as acceptable.

  1. Make sure all dirt and debris are removed from the tiny holes.
  2. If you don’t feel confident repairing yourself, have your RV serviced by a certified RV technician.
  3. The air conditioner fixed to the roof’s peak is held in place with the help of covers and screws.
  4. Because of this, you must be cautious and pay attention to how things are organized there.
  5. It is necessary to remove the evaporator cover, which is frequently fastened with many screws.
  6. After that, remove the dirt and debris with the proper cleaner.

How To Clean Drain Pan in RV Air Conditioner Unit

  1. Find the shroud by climbing onto the RV’s roof. The air conditioner’s shroud is its outside cover.
  2. A unique interior cover will be placed over the draining pan. Make use of a screwdriver to remove the cover.
  3. The evaporator coil would also be visible. Remove the evaporator coil and drain the pan of debris and any clogs.
  4. Coils should be cleaned before the covers are back reinstalled.

Make sure you only perform these processes if you are fully aware of every detail of these components; otherwise, try to take professional help. Here, a misstep may make things worse.

Replace Leaking Loose or Tight Gasket

The air conditioner is sealed to the roof with a rubber gasket. If these are changed, they may be fitted too loose or too tight, leading to a water leak issue.

The fasteners used to fix an air conditioner to the roof are typically number four or more and need tightening evenly. (Read RV Water Hose Insulation Guide)

This is important because if no gap is left, the water may become trapped and run inside the RV rather than on the roof.

The water runs down the roof, and the bottom of the air conditioner as condensation builds up. Therefore, keeping a gasket gap is crucial to allow water to leak onto the roof.

Gaskets require little maintenance, though they may deteriorate and end up with small holes or cracks, so in that case, swap it out, so water drains away from your AC rather than causing costly repairs.

The gasket and drain pan need to be debris-free, and use a recommended cleaner from your AC manufacturer. If your AC is under warranty, get the company to fix it rather than take a DIY approach.

As an RV owner, ensure you replace the inside cover, or you can leave space for water to get in once it rains, or you get more moist air condensing from AC use and humid weather.

Fix Clogged Drain Pipe

If a drain pan is filled with dirt and debris, it might not hold the water. The drain pipe helps to take water from the drain pan outdoors and onto the RV roof.

The whole process is straightforward: water from the evaporator, which you get from the cooling process or even higher humidity, is transported to the drain pan, where it is thrown out by the drain pipe.

The water won’t drain if the drain pipe is blocked by debris. And when it does, it will be the root cause of water leaking inside your camping trailer. (Read Is It Illegal To Sleep On The Beach)

Therefore, how do you unblock the drain pipe in the affected area?

You have two options: take your camper to a qualified mechanic or do it yourself using the steps below.

  1. Before starting, remove and dry off the drain pan because it can already be filled with water.
  2. If there is any debris in the drain pan, check it. Next, check the drain pipe’s end for debris and try your best to clean it.
  3. You can also use a soft brush to clean the pipe thoroughly. Just be sure to make overdoing it.
  4. Apply bleach to the area to further clear it once the drain pipe and drain pane have been properly cleaned of debris. Bleach will help prevent the growth of algae as the water starts its slow flow from condensation.



Why Is My Air Conditioner Leaking Water Outside?

You could occasionally notice your air conditioner leaking water outside. It may be worrisome to step outside and discover water behind your air conditioner’s condenser unit, but it’s vital to know when an air conditioner leaking water is normal.

How Much Water Should Be Leaking from My Air Conditioner?

Your air conditioner’s condensation amount will vary depending on a few variables:

Take your location, as this will affect the water flowing from your condenser unit.

It’s natural and a typical side effect of an air conditioner working hard, especially on exceptionally humid days, if you return to find a little puddle of condensation close to the drain pipe.

Similarly, if a little puddle is seen behind your air conditioner’s condenser, it is most likely caused by typical usage.

How Much Water Is Too Much?

There is a thin line between when your air conditioner is operating as it should and when it might need to be repaired, mainly if you are unclear about how much water leakage to expect from your AC unit on your RV’s roof.

Your air conditioner should only leak or produce condensation while running normally and have no reason to fix it. A small water pool should after that disappear on a hot day.

If the water leak continues for a day or more, that may be a red flag that your air conditioner needs to be repaired.

What Causes My Air Conditioner to Leak Water?

Several things, including: could bring on your air conditioner’s water leak

  • Unclean air filters: When your air conditioner’s air filter is unclean, partially blocked, or entirely clogged, the evaporator coils are more likely to freeze, which leads to extra water overflowing from the drain pan.
  • Broken condensate pan: Depending on the age of your AC unit, your condensate pan may rust, crack, or split over time, leading to water leaking from your air conditioner.
  • Blockage in the drain pipe: Your air conditioner’s water is routed to the drain pan through a complicated system of drain pipes. A blocked drain pipe may result in water leaking from your air conditioner.
  • Poor installation—If your air conditioner is relatively new and leaks a lot of water, the problem was probably created during installation. Your air conditioner might begin to leak water if the drainage pan was placed improperly or sized wrong.
  • Cold temperatures: As the air conditioning season ends, using your air conditioner while it’s too cold outdoors may cause it to leak. The coils in your unit may freeze as it tries to cool your house when the outside temperature is below 60 degrees, which could lead to water leakage.
  • Low refrigerant levels – If your refrigerant levels are low, your air conditioning system’s pressure will also drop, leading to the evaporator coils freezing. Your drain pan may overflow and leak water if those coils freeze.


Dust and moisture are removed from the RV by the air conditioner. Thus, there is a high likelihood that dust will clog up various system parts that shouldn’t have debris inside them.

Thus, perform routine maintenance on the AC unit to keep it functioning correctly. Since an air conditioner is quite expensive, keeping it free of any problems is usually a good idea. (Read What’s The Difference Between A Hatchet And An Axe)

Because of all the dirt and debris, the air conditioner, which is located outside, can take lots of abuse, and despite its strength, the AC cover may not perform as it should while on the road.

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