When it's 112°F in Redding and your RV AC decides to quit, that's not an inconvenience — that's an emergency. Here's how to know if your system is ready before summer hits hard.
Let's skip the small talk: Redding, CA is one of the hottest cities in the continental United States. June through September, temperatures regularly crack 105°F. On the bad days — and there are plenty of them — the mercury climbs to 112°F and the blacktop outside your RV radiates heat back up like a second sun.
In that environment, your RV air conditioner isn't a comfort feature. It's life support. And unlike your home AC, your RV unit takes the full force of that heat while parked in direct sun, often with zero shade, on surfaces that hold heat long after sunset.
The question isn't whether your AC will get tested this summer. It's whether it'll survive the test.
5 Signs Your RV AC Is Already Struggling
Most RV air conditioners don't fail all at once. They limp — giving you hints weeks before they finally quit on the hottest Sunday of the year. Here's what to watch for:
It runs but doesn't cool
If your AC is blowing lukewarm air, your refrigerant could be low, your evaporator coil may be dirty or damaged, or the compressor is on its way out. Running it harder won't fix any of those things — it just accelerates the failure.
It short-cycles — turns on and off every few minutes
Short-cycling means the system shuts itself down before a full cooling cycle finishes. Usually a failing capacitor, a refrigerant pressure issue, or an electrical fault. Every startup puts additional wear on the compressor.
Unusual noises — grinding, rattling, or gurgling
Grinding means a bearing is failing. Rattling usually means loose components or debris in the fan shroud. Gurgling points to refrigerant or moisture in the lines. None of these are 'wait and see' sounds.
Ice forming on the unit
Ice on an RV AC looks counterintuitive but means the opposite of what you'd hope. It typically indicates restricted airflow from a dirty filter, or low refrigerant. The ice makes it worse by further reducing airflow — a downward spiral.
Your shore power keeps tripping the breaker
A struggling AC draws more amperage as it works harder. If your 30-amp or 50-amp hookup is tripping at the campsite, the AC may be pulling more than it should. That's a symptom, not a fluke.
What You Can Do Right Now
Before calling anyone, run through this checklist. These five steps take less than 20 minutes:
- Clean or replace your roof filter — a clogged filter reduces airflow by 30–40% and is the #1 cause of ice buildup and poor cooling. In Redding summers, clean it monthly.
- Check all interior ceiling vents — make sure none are blocked by furniture, curtains, or anything stored near the ceiling.
- Confirm you have adequate power — RV ACs typically pull 13–15 amps. On 30-amp service, that's half your load capacity. Don't run the microwave and AC simultaneously.
- Test it in the morning — don't wait until it's 108°F to find out it doesn't work. Run a 10-minute test in the cool of the morning.
- Check the thermostat batteries — sounds obvious, but dead thermostat batteries have wasted more than a few summer days.
Pro tip
If your RV has two AC units and one isn't keeping up, check whether your generator is producing adequate power. An RV generator running lean will underproduce, causing the AC to underperform. Two separate problems that look like one.
What You Can't Fix With a YouTube Video
- Low refrigerant or refrigerant leak — handling refrigerant requires EPA 609 certification. If your unit is low, it needs a licensed tech.
- Failed compressor — the heart of the system. Not a DIY repair. This is a full unit assessment situation.
- Bad start capacitor — this involves discharging a component that holds a dangerous charge even with power off.
- Cracked evaporator coil — when the coil cracks, refrigerant escapes and the unit simply won't cool. Attempting to 'seal' it is a temporary illusion.
Common Question
Can I just wait until it completely fails and replace the whole unit?
Technically? Yes. Strategically? No. RV AC units go on backorder fast in peak season. Lead times in June and July can stretch 2–4 weeks. If your AC dies on the 4th of July weekend in 110°F Redding heat, you will not be getting a next-day replacement. Get it inspected before summer peaks — not after it fails.
Bottom line: summer in Northern California is not the time to be optimistic about a weak AC unit. The repairs that cost a few hundred dollars in May become a miserable, expensive emergency in July. Get ahead of it before the heat wave hits.
BossBros RV Team
Redding, CA