How to Fix a Squeaking Dometic Fan-Tastic Roof Fan in Your RV

Short Answer

Since your Fan-Tastic roof fan is squeaking but the fan blades aren't rubbing the housing, the issue is most likely dried-out motor bearings or bushings inside the motor assembly. This is a common problem that can usually be resolved with proper lubrication of the motor bearings, though in some cases the motor may need replacement if the bearings are severely worn.

Understanding the Problem

The squeaking you're hearing from your Fan-Tastic roof vent is typically caused by inadequate lubrication in the motor's bearing system. Over time, the factory grease in the motor bearings dries out due to heat, vibration, and age, causing metal-on-metal contact that creates that irritating squeak. Since you've confirmed the fan blades aren't hitting the housing, the motor assembly is definitely the culprit.

Most Fan-Tastic models use either ball bearings or sleeve bearings in their motors. The older models often have oil-impregnated bronze bushings that can be re-lubricated, while newer models may have sealed bearings that are more difficult to service. The motor assembly sits inside the fan housing, and accessing it requires removing the fan from the roof vent opening.

Environmental factors accelerate this problem - RVs experience temperature extremes, constant vibration from driving, and exposure to dust and moisture that can contaminate the bearings. If caught early, like in your case where it's just starting to be noticeable, lubrication usually solves the problem completely.

What You'll Need

For this repair, you'll need a few basic tools and supplies. Get a Phillips head screwdriver to remove the fan assembly, and possibly a flat-head screwdriver for prying off any covers. You'll need 3-in-1 oil or light machine oil - avoid heavy oils or grease as they can attract dirt and debris.

A small needle-nose oiler or oil pen works best for precise application, though you can also use a small brush or even a toothpick dipped in oil. Have some clean rags or paper towels ready for cleanup. If you discover the motor has sealed bearings that can't be lubricated, you might need a replacement motor assembly, which typically costs between $80-150 depending on your Fan-Tastic model.

Safety-wise, make sure you have the fan's power turned off at the switch and ideally disconnect power at the circuit breaker or fuse. A small flashlight or headlamp will help you see the motor assembly clearly once you have the fan removed.

How to Fix It

Start by turning off the fan and disconnecting power to be safe. Use proper ladder safety and consider fall protection when accessing the roof-mounted fan. Remove the fan assembly by unscrewing the mounting screws that hold it to the vent housing - there are typically 4-6 screws around the perimeter. Before disconnecting any wiring, mark or photograph the wire connections for proper reassembly. Then carefully lift out the entire fan and motor assembly.

Examine the motor assembly closely. Look for small oil ports or felt washers near the motor shaft - these are designed for lubrication access. If you see these, apply 2-3 drops of 3-in-1 oil to each access point. If there are no obvious lubrication points, you may need to carefully separate the motor housing to access the bearings - however, this should only be attempted on serviceable motors and requires proper safety precautions including complete power disconnection. Many newer models have sealed motor units that should not be disassembled and require complete motor replacement instead.

For motors without obvious lubrication access, try applying a small amount of oil where the motor shaft enters the housing on both ends, being careful not to over-apply as excess oil can attract dust and debris. Work the fan blade by hand to help distribute the oil into the bearings. You should notice the squeaking diminish as you work the oil in. Reassemble everything in reverse order, making sure all screws are tight and wiring connections are secure.

Test the fan on all speeds to ensure the squeaking is gone and the fan operates smoothly. If the noise persists or returns quickly, the bearings may be too worn and you'll need to replace the motor assembly. This job typically takes 30-45 minutes and costs under $10 in materials if lubrication solves the problem.

Leave It to the Experts

Consider having a professional handle this repair if you're uncomfortable working on electrical components or if the fan assembly seems difficult to access safely. RV service technicians can quickly diagnose whether lubrication will solve the problem or if motor replacement is necessary, potentially saving you from buying unnecessary parts.

If your Fan-Tastic vent is still under warranty, definitely contact Maxxair/Airxcel or your dealer before attempting repairs, as DIY fixes might void coverage. Professional repair typically costs $100-200 including labor, which might be worthwhile if you're dealing with multiple roof vent issues or if the motor needs replacement anyway.

Some RV service centers offer preventive maintenance packages that include lubricating all roof vent fans, which can prevent this issue from occurring in the first place. This is especially valuable if you have multiple roof vents or if your RV sees heavy use in dusty or extreme temperature conditions.