There is no worse feeling in full-time RV life than a critical system failing in the middle of January with nowhere to be towed and no mobile tech available until Monday. I’ve been there. That experience is why I now maintain everything on a schedule and know how to handle the repairs myself. On the Jayco North Point, the rooftop AC unit is one of the hardest-working systems in the rig, and when the capacitor or fan motor starts to fail, you’ll notice it immediately — the unit struggles to start, runs hot, blows weak air, or just clicks and dies — and if you’re parked in the desert in July, that’s not a situation you can wait out until Monday morning. This guide walks you through exactly what I did to diagnose and replace both components myself, with the real-world detail that generic repair manuals always seem to leave out.
The Capacitor That Stops the AC Death Spiral on a North Point
On a Jayco North Point, the dual run capacitor is the first thing to fail when your rooftop AC starts struggling to turn on or the fan motor runs but the compressor won’t kick in. This $15 part fails silently — no warning, just a unit that hums and clicks but never actually cools.
The capacitor’s job is simple but critical: it stores electrical charge and releases it in controlled bursts to help the compressor motor and fan motor start and run smoothly. When it degrades, it can no longer hold that charge effectively. You’ll see this play out as delayed startup, weak cooling, or a unit that cycles on and off rapidly because the thermostat can’t maintain stable operation.
Diagnosing a Failed Capacitor
Before you order a replacement, confirm the capacitor is actually the problem. The telltale signs are unmistakable: you turn on the AC, hear the compressor trying to engage but failing, or the fan spins but nothing else happens. Some units will simply click repeatedly without any motor engagement at all.
Never touch the capacitor terminals with bare hands or tools while the power is on — these components hold a charge even after shutdown and can deliver a painful shock. Always kill the breaker first. If you want to test the capacitor before replacing it, a multimeter set to capacitance mode will show if it’s holding charge properly, but honestly, if your AC is behaving like this and the capacitor is five or more years old, replacement is the fastest path forward.
What works
- AC compressor actually engages on the first try instead of clicking and struggling through a 30-second startup cycle.
- Fan motor spins at full speed immediately — no more weak airflow that gradually picks up as you’re already sweating inside the cabin.
- Thermostat stops cycling the unit on and off every few minutes because the capacitor can no longer hold a stable charge.
What doesn’t
- Dometic and Coleman-Mach use slightly different connector terminals — double-check your exact unit model before ordering or you’ll be waiting for a return and a reorder.
- Most Amazon sellers ship these from warehouses without climate control; if the capacitor sits in a hot truck for three days before delivery, it may arrive already degraded and fail within weeks.
I ordered a generic capacitor the first time and didn’t check the voltage rating — it fit in the slot but wouldn’t let the compressor motor start, and I spent an hour thinking the control board was fried. RV AC dual run capacitor (Dometic/Coleman-Mach)
Replacing the Capacitor: Step-by-Step
The actual replacement takes about 15 minutes once you’ve got the AC unit’s cover off. First, turn off the breaker — and I mean completely off, not just the thermostat. Take a photo of the capacitor terminal connections with your phone before you disconnect anything. The terminals are usually color-coded (red, yellow, blue, or black), but the photo will save you from guessing if you second-guess yourself midway through.
Use a small flathead screwdriver to gently pry the spade connectors off the capacitor terminals. Don’t yank them or you’ll bend the terminal prongs. Once they’re free, note which wire goes where — or better yet, use a small piece of masking tape and label each one. Remove the old capacitor from its mounting bracket, slide the new one in, reconnect in the exact same order, and secure it with the bracket.
Turn the breaker back on, set the thermostat to cool, and listen. The compressor should engage cleanly and the fan should ramp to full speed within two seconds. If it still clicks and hesitates, check your terminal connections first — a loose spade connector is the most common reason for a replacement capacitor to not work.
When the Fan Motor Itself is the Problem
Sometimes the capacitor is fine, but the fan motor won’t spin at all — or spins sluggishly and then cuts out. This is wear and bearing failure, not an electrical issue. The good news is that you can confirm this by trying to gently spin the fan blade by hand when the power is off. If it doesn’t spin freely or feels gritty, the bearing is shot.
Fan motor replacement is more involved than a capacitor swap because you’ll need to remove the entire air distribution plenum to access the motor mounting bolts. On a North Point, this means pulling out the aluminum ducting and the plastic shroud. Have a helper handy because these components are awkward to manage alone on your back in a confined space.
The North Point uses either a Dometic or Coleman motor depending on year and configuration. Order the exact match for your unit before you start disassembly. The replacement motor will come with new mounting brackets and gaskets — use them. The old gasket material crumbles when you peel it off, and reusing it guarantees an air leak that will reduce cooling efficiency by 20 percent.
Preventing Future Failures
Once your AC is running smoothly again, keep it that way. Clean the return air filter every two weeks during heavy use. If you’re parked in the sun during summer, throw a reflective cover over the rooftop AC unit — this reduces ambient temperature around the components and extends capacitor life significantly. Run the AC for at least 15 minutes every few weeks even during shoulder seasons; capacitors degrade faster when they sit idle.
RV AC dual run capacitor (Dometic/Coleman-Mach)
Replaced mine and stopped watching the thermostat cycle every few minutes while running.
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