Why is My RV Ac Dripping Water Inside?

ecreational vehicles RVs provide the perfect escape from the daily grind, allowing you to hit the open road and explore new destinations. One common issue that many RV owners face is the problem of their air conditioner AC unit dripping water inside the vehicle. If you’re wondering, Why is My RV Ac Dripping Water Inside? This can be a frustrating problem. 

But it’s essential to understand the potential causes and solutions. In this article, we’ll explore the reasons why your RV AC might be dripping water inside and discuss the steps to diagnose and rectify the issue. We’ll also provide tips on AC maintenance to prevent future occurrences.

Common Causes of RV AC Water Leaks

Common Causes of RV AC Water Leaks

When your RV AC system starts leaking water inside or if you’re wondering how to run your RV air conditioner on 30 amps, it can be caused by various factors. Understanding these factors is the first step in addressing the issue. Explore the most common reasons for this problem.

Insufficient Drainage

RV air conditioners are designed to remove moisture from the air, but if the drainage system is blocked or insufficient, the excess condensation can lead to water leaks.


  • Water drips from the AC unit, often near the interior air distribution panel.
  • Increased humidity levels inside the RV.


  • Check the condensate drain line for clogs or kinks.
  •  Ensure the drain line is properly sloped for efficient drainage.
  •   Clean the drain pan and the drain line regularly to prevent blockages.

Frozen Evaporator Coil

Inadequate Airflow or Low Refrigerant

A frozen evaporator coil is another common issue that can cause water leaks. When the coil freezes, it eventually thaws, leading to excess water inside your RV.


  • Water dripping inside the RV.
  • Reduced cooling performance of the AC.


  • Check for clogged air filters or obstructed air intake.
  • Ensure the refrigerant levels are correct by hiring a professional if needed.
  • Allow the frozen coil to thaw completely before restarting the AC.

Roof Seal Damage

Cracked or Deteriorated Roof Seals

The integrity of the roof seal around the AC unit is crucial in preventing water leaks. Damage to this seal can allow rainwater or condensation to enter the RV.


  • Water entering from the AC unit during rainy conditions.
  • Water stains or damage around the ceiling.


  • Inspect the roof seal for cracks, gaps, or deterioration.
  • If damage is found, reseal the area with appropriate sealant.

AC Unit Installation Issues

Improper Installation

Sometimes, water leaks result from improper installation of the AC unit. This could include incorrect levelling, poor sealing, or issues with the unit’s gasket.


  • Water leaks around the AC unit.
  • Uneven cooling inside the RV.


  • Ensure the AC unit is properly levelled.
  • Inspect the gasket and sealing to verify they are secure and intact.
  • If necessary, consider seeking professional assistance to reinstall the unit correctly.

Clogged Evaporator Drain Pan

Accumulated Debris and Algae

The evaporator drain pan collects condensate and directs it outside. Over time, this pan can become clogged with debris, leading to water accumulation and leaks.


  • Water dripping from the AC unit.
  • Musty odours inside the RV.


  • Regularly clean the drain pan to remove debris and algae.
  • Use a mixture of water and bleach to clean and disinfect the drain pan.

Diagnosing the Issue

Identifying the specific cause of your RV AC water leak is essential for effective troubleshooting. Here’s a step-by-step guide to help you diagnose the issue:

Observe the Leak

Carefully observe where the water is coming from and under what conditions it occurs. This can provide valuable clues about the source of the problem.

Check the Drain Line

Inspect the condensate drain line for any obstructions or kinks. Ensure it has a proper slope to facilitate drainage.

Inspect the Evaporator Coil

Examine the evaporator coil for signs of freezing or excessive condensation. Pay attention to the state of the air filters and the airflow around the coil.

Examine the Roof Seal

Inspect the roof seal around the AC unit for any visible damage or deterioration.

Review Installation

If possible, review the installation of the AC unit to ensure it’s correctly leveled and sealed. Seek professional assistance if required.

Clean the Drain Pan

Remove and clean the evaporator drain pan to eliminate any accumulated debris or algae.

Preventive Maintenance

Preventing RV AC water leaks is preferable to dealing with them after they occur. Here are some maintenance tips to help you avoid future issues:

Regular Cleaning

Perform routine cleaning of the condensate drain line, evaporator drain pan, and air filters. This prevents blockages and ensures efficient operation.

Roof Seal Inspection

Inspect the roof seal around the AC unit at least once a year. Repair any damage or deterioration promptly to prevent water ingress.

Professional Servicing

Consider scheduling regular professional servicing of your RV’s AC unit to check refrigerant levels and ensure proper installation and functionality.

Adequate Insulation

Improve insulation inside the RV to minimise condensation. Well-insulated RVs are less likely to experience water leaks.

RV AC Maintenance Tips

When it comes to RV AC maintenance, a few simple steps can make a big difference. Regularly checking and cleaning air filters, inspecting coils, and ensuring your thermostat works correctly can keep your RV cool and comfortable. Plus, if you consider upgrading to an energy-efficient ducted system and have the right tools handy, you’ll be well-prepared for any road trip, no matter the season.

In seasonal maintenance like preparing your AC unit for summer and winter, having a maintenance routine for your RV AC system, including addressing issues like Ac Dripping Water Inside, will keep you worry-free and enjoy your adventures. Remember, it’s all about taking a little time to maintain your RV’s cooling system to ensure it stays in tip-top shape.

Regular Inspection

Regularly inspect your RV’s air conditioning system to catch issues early and prevent water leaks. This should be part of your routine maintenance.

Check the Thermostat: Ensure the thermostat is functioning properly and set at the desired temperature.

Examine the Air Filters: Clean or replace air filters as needed to maintain good airflow.

Inspect the Coils: Look for any dirt or debris on the evaporator and condenser coils, as this can affect efficiency and lead to condensation issues.

Understanding Refrigerant Levels

Proper refrigerant levels are crucial for your AC unit to function efficiently. Low refrigerant levels can result in poor cooling performance and potentially lead to water leaks.

Hire a Professional: Consult an HVAC technician to check and adjust the refrigerant levels if needed.

Avoid DIY Refrigerant Handling: Refrigerant handling should be left to professionals due to environmental and safety concerns.

AC Unit Replacement Considerations

Regular InspectionCheck the thermostat for proper operation.
Understanding Refrigerant LevelsConsult an HVAC technician for a refrigerant check.
AC Unit Replacement ConsiderationsConsider upgrading to a ducted system.
AC Maintenance ToolsHave essential tools like screwdrivers, condensate pan treatment tablets, multimeter, and condenser coil brush.
Seasonal Maintenance TipsPreparing for Summer
Winterizing Your RV ACCover the AC unit with a winter cover.

Upgrading to a Ducted System

If you’re frequently dealing with water leaks and other issues with your current RV AC unit, it might be time to consider an upgrade to a ducted system.

  •  Even Cooling: Ducted systems distribute cool air more evenly throughout the RV.
  • Reduced Noise: These systems are quieter compared to non-ducted models.
  • Less Condensation: Properly installed ducted systems can reduce condensation issues.

Choosing Energy-Efficient Models

When replacing or upgrading your RV AC unit, consider models that are energy-efficient and environmentally friendly.

Inverter Technology: Inverter AC units are more energy-efficient and maintain a consistent temperature.

Low Power Consumption: Choose units with lower power requirements to save on electricity when boondocking or using a generator.


Why is my AC leaking rain?

Your AC may be leaking water because of a clogged drain line or a refrigerant issue, causing condensation to form and drip.

Is water dripping from AC safe?

Water dripping from an AC unit can be safe if it’s just condensation, but it may indicate a problem if it’s a refrigerant leak, which can be harmful.


Experiencing water leaks from your RV’s air conditioning unit can be frustrating, but it’s a common issue with various potential causes. By understanding the common reasons for RV AC water leaks and following the diagnostic steps outlined in this article, you can effectively address the problem and enjoy a comfortable and leak free RV experience.

Regular maintenance and proactive measures are essential for preventing future water leaks. By following these tips and ensuring your RV’s AC system is in good working condition, you can avoid the hassle and potential damage associated with water leaks inside your RV. Safe travels and a comfortable living environment await you with a properly functioning AC system in your RV.

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