Rv Air Conditioner Not Blowing Cold Air

Introduction

Is your RV air conditioner blowing warm air instead of a refreshing chill? This is a common and frustrating problem, especially when you’re counting on it to keep you cool during your travels. A malfunctioning RV AC unit can make your RV feel like an oven, impacting your comfort and even posing health risks in extreme heat. Diagnosing and fixing the issue promptly is important to enjoy your RV adventures.

Common Causes of RV Air Conditioner Not Blowing Cold Air

Several factors can contribute to your RV air conditioner failing to blow cold air:

• Dirty Air Filters: Clogged filters restrict airflow, reducing the AC’s efficiency.
• Dirty Evaporator or Condenser Coils: Dust and debris on the coils prevent heat transfer.
• Low Refrigerant: A leak in the system can lead to insufficient refrigerant for cooling.
• Faulty Fan Motor: A failing fan motor can hinder airflow over the coils.
• Blocked Vents or Ducts: Obstructions in the vents or ducts can restrict airflow.
• Frozen Evaporator Coil: Ice buildup on the coil restricts airflow and cooling capacity.
• Capacitor Issues: A weak or failing capacitor can prevent the compressor or fan motor from starting.
• Overloaded Electrical Circuit: The AC unit might not be receiving enough power.
• Incorrect Thermostat Setting: The thermostat may be set too high or malfunctioning.
• Old Age: The unit’s components may be simply worn out from normal use.

Symptoms Checklist

Use this checklist to help pinpoint the problem:

• The air conditioner turns on, but blows warm air.
• The air conditioner makes unusual noises.
• The air conditioner cycles on and off frequently.
• The air conditioner is leaking water inside the RV.
• The airflow from the vents is weak.
• Ice is visible on the air conditioner’s fins or coils.
• The air conditioner trips the circuit breaker.
• The air coming out smells musty or moldy.

How to Fix RV Air Conditioner Not Blowing Cold Air Step-by-Step Guide

Here’s a step-by-step guide to help you troubleshoot and potentially fix the issue:

1. Safety First: Turn off the RV air conditioner and disconnect the power supply.
2. Check the Thermostat: Ensure the thermostat is set to “Cool” and a temperature lower than the current room temperature. Verify the fan setting is on “Auto” or “High.”
3. Inspect the Air Filter: Locate and remove the air filter. Clean or replace it if it’s dirty.
4. Clean the Evaporator Coils: Access the evaporator coils (usually under the interior cover). Use a soft brush and vacuum to remove dust and debris. Special coil cleaner can be helpful.
5. Clean the Condenser Coils: Access the condenser coils (usually on the roof unit). Use a soft brush and vacuum to remove dust and debris. Be careful not to bend the fins.
6. Check for Frozen Coils: If you see ice, turn off the AC and let it thaw completely. Then, clean the air filter and coils, as described above. This can happen if the airflow is restricted.
7. Inspect Vents and Ducts: Check all vents and ducts for obstructions. Remove any debris or blockages.
8. Verify Power Supply: Ensure the RV is connected to a reliable power source with sufficient amperage. Try plugging into a different outlet or generator.
9. Inspect the Fan: Check that the fan is spinning freely. If it’s not, the motor might be failing.
10. Listen for Unusual Noises: Strange noises could indicate a problem with the compressor or fan motor.
11. Check the Capacitor: (Advanced) Capacitors store energy for the motor. This step requires experience. Visually inspect the capacitor. If it’s bulging or leaking, it’s likely bad. Warning: Capacitors can hold a charge even when disconnected. Discharge them properly before handling.
12. Reset the Air Conditioner: Turn off the breaker and turn it back on. This can sometimes reset the system.
13. Run a test after each check: Turn on the AC unit and monitor its performance. Allow at least 15 minutes for the unit to start cooling.

Fix the Issue Without Buying Parts

Many RV air conditioner problems can be resolved without immediate part replacements:

• Regular Cleaning: Consistent cleaning of air filters and coils is crucial for optimal performance.
• Check for obstructions: Routinely inspect and clean vents, ducts and the area around the AC unit, on the roof.
• Correct Power Supply: Check if the AC unit has adequate voltage and amp.
• Thermostat Setting: Ensure the thermostat is accurate and set correctly.

When Replacement Might Be Necessary

If the above steps don’t resolve the issue, or if the unit is very old (10+ years), replacement might be necessary. Common failing parts include the compressor (expensive, $500-$1000 + labor), fan motor ($100-$300 + labor), and control board ($100-$250 + labor). Replacing the entire unit typically costs between $800 and $1500, including installation. Get professional opinions before replacing any parts. For more related activities, check out our Ac Condenser Unit Freezing Up.

Safety Warning

• Always disconnect the power supply before working on the air conditioner.
• Be careful when working on the roof of your RV. Use a sturdy ladder and have someone spot you.
• Do not touch any electrical components with wet hands.
• If you’re uncomfortable working with electrical components, consult a qualified technician.
• Do not over tighten any screw or parts.

Tools You May Need

• Screwdrivers (Phillips and flathead)
• Vacuum cleaner with brush attachment
• Soft brush
• Fin comb (for straightening bent fins)
• Multimeter (for electrical testing – advanced)
• Work gloves

FAQ

Here are some frequently asked questions about RV air conditioners:

• Q: Why is my AC blowing hot air after I cleaned the filter?
  A: Ensure the coils are also clean. A dirty coil restricts airflow, even with a clean filter.
• Q: My AC runs constantly but doesn’t cool the RV. What’s wrong?
  A: This could indicate low refrigerant, a dirty condenser coil, or a failing compressor.
• Q: How often should I clean my RV AC filter?
  A: Clean the filter every 2-4 weeks, depending on usage and environment.
• Q: Can I add refrigerant to my RV AC myself?
  A: Adding refrigerant requires specialized tools and knowledge. It’s best left to a qualified technician.

Conclusion

Troubleshooting an RV air conditioner can seem daunting, but by following these steps, you can often diagnose and fix the problem yourself. Regular maintenance is key to preventing issues and keeping your RV cool and comfortable. If you’ve tried these steps and the AC still isn’t blowing cold air, it’s time to call a qualified RV technician. Remember, addressing the problem early can save you money and prevent more serious damage.

Youtube Video: