Complete repair guide for the Holiday Rambler Navigator – AC Capacitor & Fan Motor Service. Follow these steps to diagnose and fix the issue yourself.
Parts & Tools You’ll Need
- 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 — RV AC dual run capacitor (for Dometic or Coleman-Mach)
- HHQ RV Air Conditioner Motor with Capacitor, Direct Replacement for Coleman Mach RV AC Fan Motor, Replaces Fasco D1092, 1/3 HP, 115 Volts, 1675 RPM, 5-Year Warranty — RV rooftop AC fan motor
- 3106996022 3106996.022 Heat & Cool Thermostat Relay Analog Control Circuit Board Kit for Dometic RV Air Conditioner (White) — RV AC thermostat / control board
- CRC (05084-12PK) Brakleen Non-Chlorinated Brake Parts Cleaner – 14 oz., (Pack of 12) — AC evaporator/condenser coil cleaner foam
- LEDBarz RV Air Conditioner Shroud Cover Screws (10 Pack) for Dometic RV Brisk II and Penguin II Roof Top Air Conditioner, Replacement Parts for Dometic 3310724.0040000002 — Rooftop AC shroud / outer cover
- Dongxw Self Leveling RV Roof Sealant White, 4 Pack Camper Roof Sealant, Lap Sealants for RVs Roofs, Waterproof Flexible RVs Sealants and Caulk for Trailer, Maintenance, Repair — AC roof gasket & self-leveling sealant
- AMI PARTS FCR6 Fin Comb Set for Air Conditioner FCR6 Coil Fin Comb Ring Straighten Evaporator Condensor — Fin comb / coil straightener tool
- FKM Infrared Thermometer Gun Non-Contact Laser Temperature Gun,-58°F~986°F(-50°C~530°C) AdjustableEmissivity,Digital Thermometer Gun for Industrial,Kitchen Cooking,Oven,Automotive,HVAC,Not for Human — Non-contact infrared thermometer
Step 1: Diagnose AC Failure and Disconnect Power
Start by turning off your RV’s main electrical breaker and the AC unit itself at the thermostat to ensure complete power disconnection. Use a non-contact infrared thermometer to check the current temperature differential between the intake and output air—a reading of less than 10°F indicates a failed capacitor or fan motor. Document any unusual noises (grinding, humming without cooling, or clicking relays) as these symptoms will confirm whether you’re replacing the capacitor, fan motor, or both.
Step 2: Remove Rooftop AC Shroud and Inspect Components
Climb onto your Holiday Rambler’s roof and locate the four corner bolts securing the RV rooftop AC shroud. Remove these bolts using a 3/8-inch socket wrench and carefully lift away the outer cover, being mindful of any wiring connections to the thermostat control board. Once exposed, visually inspect the dual run capacitor (a cylindrical component typically rated 30/5 µF at 370V) and the fan motor for obvious signs of damage, corrosion, or burnt terminals.
Step 3: Test and Replace the Dual Run Capacitor
With power still disconnected, use a multimeter set to capacitance mode to test the existing RV AC dual run capacitor—readings should match the rating (usually 30/5 µF); anything significantly lower indicates failure. Discharge any remaining voltage by connecting an insulated screwdriver across the capacitor terminals for 5 seconds. Disconnect the wire harness from the old capacitor, note the terminal positions (common, herm, and fan), and install the replacement RV AC dual run capacitor by reversing the process, ensuring all terminals are tight and corrosion-free.
Step 4: Clean and Straighten AC Coils
With the shroud removed, spray the AC evaporator/condenser coil cleaner foam across both the intake and output sides of the coil, allowing it to sit for 10 minutes to break down dust and debris buildup. Use the fin comb / coil straightener tool to gently comb through any bent aluminum fins, working from top to bottom in straight, parallel strokes—bent fins reduce airflow efficiency by up to 25%. Rinse the coil lightly with a garden hose on low pressure to remove loosened debris.
Step 5: Remove and Replace the Fan Motor
Disconnect the wire harness from the old RV rooftop AC fan motor by carefully releasing the wire clip connectors. Remove the three bolts (typically 1/4-inch) that secure the motor mounting bracket to the AC housing. Install the replacement RV rooftop AC fan motor by aligning the bracket holes and inserting bolts hand-tight first, then torque them to 12-15 foot-pounds—over-tightening can crack the motor housing. Reconnect the wire harness, ensuring the connector seats fully and clicks into place.
Step 6: Reseal and Reinstall the AC Shroud
Inspect the AC roof gasket for cracks or hardening; if damaged, replace it with a new gasket to prevent water intrusion. Apply a continuous bead of RV AC roof gasket & self-leveling sealant around the underside perimeter of the shroud, approximately 1/4-inch thick. Carefully lower the shroud back onto the roof, align all four corner bolt holes, and torque the bolts evenly in a cross pattern (top-left, bottom-right, top-right, bottom-left) to 18-22 foot-pounds to ensure even compression and a watertight seal.
Step 7: Restore Power and Verify AC Cooling Performance
Reconnect your RV’s main electrical breaker and set the thermostat to cooling mode at 72°F. Allow the system to run for 5 minutes, then measure the intake and output air temperature using your non-contact infrared thermometer—you should see a 15-20°F temperature differential within 15 minutes of operation. Listen for normal fan operation and verify that cool air flows steadily from all interior vents; any grinding noises, lack of cooling, or weak airflow indicates incorrect installation and requires immediate recheck of capacitor terminals and fan motor connections.