Holiday Rambler Navigator – AC Capacitor & Fan Motor Service

Holiday Rambler Navigators have a specific weak point that catches most owners off guard: the run capacitor on the rooftop AC unit fails silently, and by the time you realize something’s wrong, the fan motor is already being starved of the electrical support it needs to function properly. You’ll notice the cooling takes longer, or the fan makes a noise it didn’t before—a hum or a stutter—but the real damage is happening inside the capacitor, where the charge is degrading one day at a time. Catch this early and you’re swapping out a $40 component; let it ride and you’re facing a $300+ fan motor replacement plus control board repair. The compressor keeps running harder, the system never reaches temperature the way it should, and eventually something gives. I’ve pulled into sites where the owner thought they needed a whole new AC unit when really it was a $40 capacitor that went bad six weeks prior. This post covers the diagnostic steps I use in the field, how to pull the right replacement part for your specific Navigator model, and the procedure for getting your system back to pushing cold air without booking a service department that’s already booked solid for the next month.

Replacing the Run Capacitor Before Your Holiday Rambler Navigator AC Fan Motor Burns Out

A Navigator’s AC run capacitor doesn’t announce itself when it’s dying—it just slowly forces the fan motor to pull more amperage until the windings overheat and fail. Replace the capacitor while it’s just weak and you save $40; wait until the motor starts smoking and you’re looking at a $300+ motor swap plus potential control board damage.

What improves

• Cooling speed returns to normal—the system reaches your setpoint without that labored, dragging feeling where the compressor and fan seem to be fighting each other.
• The high-pitched whine or abnormal hum vanishes and you’re left with just the standard AC noise; that sound that made you think something was seriously wrong just goes away.
• Current draw on the motor circuit drops measurably—hook an amp meter to the fan circuit before and after and you’ll see the pull decrease by 2–4 amps, which tells you the motor isn’t fighting against a weak capacitor anymore.

What presents challenges

• Access means dismantling the shroud and sometimes working around tightly routed compressor piping; if you haven’t done rooftop HVAC before, budget closer to 45 minutes than the 15 it’ll take once you’ve done it a second time.
• The capacitor terminals carry a voltage charge even after power is off—you need to either safely discharge the system or bleed off that charge with a screwdriver before touching the terminals, or you’ll get a jolt that teaches you why this step matters.

I had one Navigator where the capacitor tested normal on my meter but the motor was still pulling hard; I almost ordered a full motor replacement before I realized the capacitor was physically swollen and internally breaking down despite the reading. That’s when I switched to always ordering a 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 as the first move.

Parts and Tools

• Replacement dual run capacitor matched to the microfarad and voltage rating on the old one (typically 60/5 MFD for Navigator models) — check current price
• Needle-nose pliers or tweezers for disconnecting small spade terminals
• Multimeter with capacitance setting to verify the old capacitor’s failure
• Insulated screwdriver set (Phillips and flathead) for removing access panels and terminal covers
• Electrical tape to insulate any exposed terminals during the swap
• Flashlight or headlamp for working inside the rooftop AC shroud

Step-by-Step Instructions

Step 1: Kill power to the AC unit at the breaker

Locate your RV’s main electrical panel and flip the breaker labeled for the rooftop AC unit to the OFF position. Wait 30 seconds, then test the AC wall thermostat to confirm no power is reaching the unit. This prevents shock risk and protects the control board from voltage spikes during capacitor removal. Do not skip this step—a live capacitor can hold a charge even when the breaker is off.

Step 2: Access the rooftop AC unit and photograph the terminal layout

Climb onto the RV roof using a ladder and safety harness. Locate the Dometic AC shroud—it’s the large rectangular box mounted above the bedroom or living area. Remove the four corner bolts holding the upper shroud cover and lift it away. Before touching anything, photograph the spade terminal connections on the capacitor and fan motor with your phone. This reference image prevents reconnection errors.

Step 3: Test the capacitor with a multimeter to confirm failure

Set your multimeter to the capacitance (microfarad) setting. Touch the probes to the capacitor terminals. A healthy 60/5 MFD capacitor should read between 54–66 microfarads on the 60 side and 4.5–5.5 on the 5 side. If readings are significantly lower or the meter shows zero, the capacitor is dead. If readings are normal but the fan still won’t spin, the motor itself is likely failed.

Step 4: Disconnect the old capacitor from the fan motor and compressor terminals

Using needle-nose pliers, gently pull each spade terminal off the capacitor. There are typically three connections: one to the fan motor, one to the compressor, and one ground. Work slowly to avoid bending the terminals. If a terminal is stuck, wiggle gently rather than pulling hard. Set the old capacitor aside and wrap the loose terminals with electrical tape to prevent accidental contact.

Step 5: Install the new capacitor and reconnect all terminals

Position the new capacitor in the same orientation as the old one. Slide each spade terminal onto its corresponding post—fan motor, compressor, and ground—using your photograph as reference. Push firmly until each terminal seats completely. Double-check that no terminals are touching each other or the metal shroud. Verify the capacitor is not touching the fan blade or any moving parts.

Step 6: Restore power and test the fan and cooling

Climb down from the roof and return to the electrical panel. Flip the AC breaker back to ON. Set the thermostat to cool and listen for the fan to spin up within 10 seconds. The fan should run smoothly without humming, stuttering, or grinding. Feel the air coming from the vents—it should be noticeably cold within 2–3 minutes. If the fan doesn’t start, turn the breaker off immediately and recheck your terminal connections.

Step 7: Reinstall the shroud cover and verify sustained operation

Once the fan runs smoothly and cooling is confirmed, climb back onto the roof and replace the upper shroud cover. Reinstall the four corner bolts and tighten them snugly—do not over-tighten, as the plastic shroud can crack. Run the AC for 15 minutes while you’re inside the RV, then check the shroud for any vibration or noise. The system should run quietly and maintain temperature without the fan cycling on and off erratically.

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