Dometic 3312195.000 AC Run Capacitor 60/5 MFD

A rooftop air conditioner is one of the simplest systems on your rig, right up until the day it won't start. You flip it on, the fan might stir, the compressor grunts, and then nothing. Before you start pricing out a whole new AC unit, check this part. The Dometic 3312195.000 is the run capacitor that lives inside a whole family of Dometic rooftop air conditioners, and it's the single most common reason one of these units stops cooling.

This is a dual run capacitor rated at 60/5 MFD, which is just a fancy way of saying it does two jobs in one can. The 60 microfarad side feeds the compressor, giving it the jolt it needs to start under load and then holding it at a steady running speed. The 5 microfarad side handles the fan motor that pushes air across the coils. Both sides share one common terminal, so a single part keeps the cold air moving. When the capacitor weakens, it can't store and release charge the way it should, and the motors either strain, overheat, or simply refuse to spin.

Knowing which side has failed tells you a lot. If the compressor hums but won't kick over, or trips the breaker on startup, that's usually the 60 MFD compressor side giving up. If the compressor runs fine but the blower is weak or won't turn, look at the 5 MFD fan side. Either way, the fix is the same part. And it's a whole lot cheaper than a service call or a new air conditioner.

This capacitor is built for specific Dometic units. It fits models 57915.741, B595146, B59146, B59186, and B59196. If your AC is one of those, this is a direct replacement. The can measures 2-1/2 inches across and 3-7/8 inches tall, so it drops into the factory bracket without any fuss. If you're swapping in a different aftermarket cap, measure your space first, because a taller unit can crowd the shroud.

Here's the one thing we tell everybody before they open up an AC: discharge the old capacitor before you touch the terminals. A capacitor stores electrical charge even after the power is off, and these hold enough to give you a real jolt. Kill the breaker, wait a minute, then short across the terminals with an insulated screwdriver before you disconnect anything. Take a quick photo of the wiring first so you know exactly where each spade lands on the new one. The swap itself takes about ten minutes once the panel is off.

One question we get a lot: can you just grab a run capacitor from the hardware store? You can, as long as the numbers match. The microfarad values have to be the same, 60/5, and the voltage rating has to meet or beat the original. This one is rated for 370 VAC, and a 440 VAC cap will physically work with no real performance difference. What you can't do is drop in a 50/5 or a 60/7.5 and hope for the best. The wrong capacitance makes the motors run hot and shortens their life, so match it to the numbers stamped on the old can.

Why do these wear out? Heat, mostly. A capacitor lives a hard life inside a hot AC housing, cycling every time the unit kicks on, and years of that eventually cook it. That's normal. It's a wear item, like a belt or a filter. The good news is that a fresh cap brings a struggling unit right back to life. Before you condemn the whole air conditioner, it's worth pulling the old capacitor and checking it with a capacitance meter. A reading well below the rated 60 or 5 microfarads confirms it's done. Plenty of dead air conditioners are really just a five-dollar-part problem wearing a scary disguise.

This is the genuine Dometic service part, MPN 3312195.000, not a guess-and-hope substitute. When you match the exact microfarad values and the voltage your unit was designed around, you get reliable starts and full cooling back. That's what you want on the hottest day of the year, which is, of course, exactly when these things decide to fail.