Newmar Bay Star Sport – AC Capacitor & Fan Motor Service

Here’s what most RV owners don’t realize until they’re trying to sell: neglected mechanical systems tank resale value faster than almost anything else. A rig with clean cosmetics and a history of deferred maintenance sells for thousands less than one that’s a little road-worn but mechanically solid. I’ve bought plenty of both. The Newmar Bay Star Sport is a solid coach, but the rooftop AC unit is one of the first things I check on every unit I walk — a failed run capacitor or a seized fan motor will kill your cooling mid-trip and, left unaddressed, can burn out the compressor entirely, turning a $30 fix into a $1,500 replacement. This guide walks you through exactly how to diagnose and swap a bad capacitor or fan motor yourself, the same way I do it before every resale — because a coach that blows cold air on a test drive closes deals, and one that doesn’t just sits on the lot.

The Run Capacitor That Stops the Fan Dead: Dometic 3312195.000 Replacement

A failed run capacitor is the silent killer of Dometic rooftop AC units—the compressor won’t start, the fan won’t turn, and you won’t know why until you’re staring at a $1,200 service call. This is the exact part that burns out on Bay Star Sports, usually somewhere between year 4 and 8, and it’s the first thing I pull when an AC unit is dead or running weak.

What works

• Direct fit for Dometic units—no guessing on voltage or MFD rating, and the 60/5 dual-run spec matches the original OEM part exactly.
• Fan spins up instantly after installation and you hear the compressor kick in within seconds; the difference between a dead unit and one that actually cools is night and day.
• Costs about $35–$50 shipped, which means even if you’re wrong about the diagnosis, you’re not out mortgage money like you would be on a full motor or control board replacement.

What doesn’t

• Amazon’s stock on this specific Dometic part number is inconsistent—I’ve seen it take 2–3 weeks to ship, which is a problem if you’re full-timing and it’s 95 degrees outside.
• You have to be confident you’ve actually isolated a capacitor failure and not a seized motor or burnt control board; pulling the shroud and testing with a multimeter is non-negotiable or you’ll buy this part for nothing.

I once swapped a capacitor on a Bay Star Sport and the fan still wouldn’t turn, which made me question the whole diagnosis—until I realized the motor shaft itself was seized from years of dust buildup, and the new capacitor just wasn’t strong enough to force it. 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

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