As the seasons shift and cooler weather rolls in, it’s the perfect time to give your RV air conditioner a little attention. Whether you’re a full-time RVer or packing up for the season, catching small issues now can save you from big headaches later.
In one of our recent Zoom workshops on Patreon, we walked through the Top 13 Most Common A/C Fails we see in the field. These are real-world problems that show up again and again — and most of them are preventable with a little know-how.
Here’s a breakdown of what to look for:
1. Dirty or Clogged Filters
Filters in the ceiling plenum are often overlooked, but they’re a major cause of reduced airflow and freeze-ups. Always check and clean them regularly.
2. Leaking Air Divider
The return and supply air must stay separated. A leaking divider causes conditioned air to mix with return air — like a dog chasing its tail — and your RV never gets properly cooled.
3. Duct Tape Failure
Foil tape used by manufacturers can lose adhesion over time, leading to loose tape and cooled air escaping into the attic. Sneaky, but fixable.
4. Misplaced Freeze Sensor
If the freeze sensor isn’t embedded properly in the evaporator coil, it won’t do its job. Different manufacturers have different placement specs, so double-check yours.
5. Dirty Evaporator Coils
Dust, dander, and debris clog these coils fast. We recommend cleaning them annually — you wouldn’t believe some of the wild before-and-after photos we have.
6. Dirty Blower Wheels
If dirt makes it past the coils, it ends up in the blower wheel. This causes vibration, reduced airflow, and extra strain on the motor.
7. Bent Fins on the Condenser
Usually caused by hail or debris, bent fins reduce efficiency. A good fin comb can help restore them.
8. Capacitor Failures
Especially common in hot climates, capacitors burn out under heavy use. They’re easy to test and replace, but often overlooked.
9. Thermostat Malfunctions
Miswiring is a frequent issue. We’ve seen compressors tied to fans and high/low fan wires reversed. Always check the wiring if performance seems off.
10. Fan Motor Problems
Squealing motors and seized bearings are common, especially in units where hot air blows directly onto the motor. Some designs just don’t help themselves!
11. Compressor Issues
If your compressor is faulty, you’re likely looking at a full unit replacement. These are sealed and not field-repairable.
12. Electrical Connection Failures
Loose, burnt, or corroded terminals can cause intermittent issues or complete failure. A visual inspection goes a long way.
13. Freeze-Ups
Often caused by airflow restrictions or sensor issues. We go deeper into this topic in the full workshop.
Why Now Is the Best Time to Check Your A/C
As temperatures drop, your A/C might not be top of mind — but that’s exactly why it’s a great time to inspect and service it. Whether you’re prepping for storage or heading south for the winter, catching issues now means smoother travels later.
🎥 Watch the Featured Segment on YouTube
We’ve pulled a portion of this workshop and published it on YouTube so you can see these issues in action:
📲 Want to Watch the Full-Length Zoom Workshop This Was Taken From?
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