Jayco Redhawk – AC Capacitor & Fan Motor ServiceSave

Jayco Redhawk – AC Capacitor & Fan Motor Service

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I pull up to broken rigs for a living, and I can tell you without hesitation which repairs show up on my schedule over and over. Not because RVs are poorly built across the board — but because a handful of systems get neglected in exactly the same ways by exactly the same owners. The Jayco Redhawk’s rooftop AC unit is a perfect example — the capacitor and fan motor are wear items that degrade quietly over a season or two, and by the time the unit starts struggling to cool or the fan starts cycling strangely, most owners have already been sweltering through two or three warning signs they didn’t recognize. If you ignore a failing run capacitor long enough, you’ll burn out the compressor, and suddenly a $30 part turns into a $1,500 replacement — a conversation I’ve had in driveways more times than I’d like to count. I put this guide together based on the exact diagnostic steps and component checks I run in the field, so whether you’re parked at a campsite or sitting in your driveway, you’ll know what you’re dealing with and how to fix it right.

Parts & Tools You’ll Need

Step 1: Diagnose AC System & Disconnect Power

Start by turning off your RV’s main electrical breaker and disconnecting the battery to ensure complete power isolation—this is non-negotiable when working with capacitors, which store electrical charge even when power is off. Use a non-contact infrared thermometer to measure the current discharge air temperature at the AC vents (you’re looking for readings around 55–65°F for a functioning system) and listen for any buzzing, humming, or grinding sounds from the rooftop unit that indicate capacitor or motor failure.

Step 2: Remove Rooftop AC Shroud & Inspect Components

Climb onto your Jayco Redhawk’s roof and locate the four corner bolts securing the rooftop AC shroud/outer cover (typically ¼-inch or 5/16-inch fasteners). Carefully lift and set aside the shroud, then visually inspect the dual run capacitor for physical damage—look for a bulging or leaking cylindrical component usually rated between 35-50 microfarads (µF)—and check the fan motor for debris, corrosion, or visible wear on the shaft.

Step 3: Discharge Capacitor & Test Motor Function

Before touching any electrical components, discharge the dual run capacitor by using an insulated screwdriver to short the terminals together for 5–10 seconds; this safely releases any residual charge. Manually spin the fan motor shaft by hand—it should rotate freely with minimal resistance; if it’s seized, grinding, or won’t turn, the motor bearings are likely failed and replacement is necessary.

Step 4: Replace Dual Run Capacitor with Correct Specifications

Unbolt the failed RV AC dual run capacitor (note the terminal wire positions before disconnection—typically labeled HERM, FAN, and COM) and install the replacement capacitor, ensuring it matches your unit’s specifications (Dometic and Coleman-Mach units commonly use 40 µF or 50 µF ratings). Tighten the mounting bracket bolt securely but don’t over-torque; hand-tight plus a quarter turn is usually sufficient for the ⅜-inch or ½-inch fastener.

Step 5: Replace Fan Motor & Reconnect Electrical Terminals

Unbolt the defective rooftop AC fan motor (typically 2–3 mounting bolts on the motor frame) and slide out the motor assembly carefully to avoid damaging the condenser fins. Install the new RV rooftop AC fan motor, aligning the shaft with the blower wheel hub, and reconnect all electrical terminals to their original positions—double-check that the HERM wire goes to the capacitor’s HERM terminal and the FAN wire connects to the motor’s run winding.

Step 6: Clean Coils & Reseal Unit Roof Penetration

Spray AC evaporator/condenser coil cleaner foam directly onto the cooling fins, working from top to bottom, and let it sit for 5–10 minutes before gently rinsing with a low-pressure hose; avoid using a fin comb/coil straightener unless fins are visibly bent, as aggressive straightening can rupture refrigerant lines. Remove the old AC roof gasket, clean the roof surface with a dry cloth, apply self-leveling sealant around the mounting base, and reinstall the shroud using the original bolts torqued to approximately 15–20 foot-pounds.

Step 7: Test System Airflow & Monitor Temperature Recovery

Reconnect your main electrical breaker and battery, set the thermostat/control board to cooling mode at 72°F, and run the system for 10–15 minutes while monitoring discharge air temperature with your infrared thermometer—you should see a rapid drop to 55–65°F within the first 5 minutes. Listen for smooth, quiet fan operation and check that the condenser fan cycles on and off as the interior temperature reaches setpoint; any unusual noises, weak airflow, or failure to cool indicates a remaining issue requiring further diagnosis.