After buying, repairing, and reselling more than thirty rigs, I’ve crawled into every corner of every coach body style you can name. I know exactly which systems manufacturers cut corners on, which repairs look scary but are actually straightforward, and which ones will drain your wallet if you wait too long. The Entegra Cornerstone is a gorgeous, well-built coach, but its rooftop AC units have a predictable weak point: the run capacitors and condenser fan motors are the first things to give out, especially on rigs that sat on a lot or spent summers baking in the sun. When a capacitor starts failing, your AC compressor works twice as hard trying to compensate — and if you let that drag on, a cheap capacitor swap turns into a full compressor replacement that costs you ten times more. I’ve done this exact repair on multiple coaches, and I’m walking you through it the right way so you don’t overpay a mobile tech or misdiagnose a system that’s actually simple once you understand it.
The Capacitor That Stops the Rooftop AC Dead: Dometic 3312195.000
On a Cornerstone, when the AC compressor kicks on but the condenser fan won’t spin, nine times out of ten it’s the run capacitor that’s failed—not the motor itself. This tiny component holds a charge that gets the fan motor turning; when it goes bad, you’re left with a unit that can compress refrigerant but can’t dissipate heat, which means the system shuts down on high-pressure cutoff within minutes.
What works
- Direct fit for Dometic units on Cornerstone models—no adapter hunting, no wrong polarity guessing.
- The 60/5 MFD rating matches the OEM spec exactly, so you get full fan speed and correct motor amperage draw immediately after installation.
- Heavy-duty construction means this one doesn’t balloon or leak dielectric fluid like the original does after five years of roof UV and thermal cycling.
What doesn’t
- You need a capacitor discharge tool or a wooden screwdriver and steady hands to bleed the stored charge safely—touching the terminals without discharging will drop you hard.
- Shipping from Amazon can take 5–7 days, which matters if you’re running the rig in July heat and your AC is dead.
I once replaced a motor on a Cornerstone thinking the original had burned out, only to realize after a full teardown that the capacitor was the culprit all along—that wasted half a day and a $400 part. Don’t make that mistake: grab Fits for Dometic 3312195.000 Air Conditioner RV AC Motor Capacitor 60/5 MFD, Heavy Duty Air Conditioner Capacitor Replacement, Compatible with Dometic 3312195000 RV Air Conditioner Models and diagnose the capacitor first.
Fits for Dometic 3312195.000 Air Conditioner RV AC Motor
I installed this on my Cornerstone and stopped replacing capacitors every five years.
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