AIRSTREAM BAMBI 16RB - Roof Vent Fan Replacement

AIRSTREAM BAMBI 16RB – Roof Vent Fan Replacement

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Complete repair guide for the AIRSTREAM BAMBI 16RB – Roof Vent Fan Replacement.

Parts & Tools You’ll Need

Step 1: Diagnose and Prepare Your Workspace

Start by inspecting your existing roof vent fan for signs of failure—look for cracked lids, non-responsive motors, or water stains around the mounting flange indicating failed seals. Turn off power to the vent at your RV’s electrical panel and verify the circuit is dead using a multimeter set to AC voltage. Clear the interior cabinet space below the vent and lay down a drop cloth or tarp on your roof to catch debris and prevent sealant from dripping onto your Bambi’s exterior. Gather all necessary tools: a cordless drill, flathead and Phillips screwdrivers, a caulking gun, a utility knife, wire strippers, and a torque wrench calibrated to 8-12 inch-pounds.

Step 2: Remove the Old Vent Fan Assembly

Climb onto your Airstream Bambi’s roof and locate the fasteners securing the vent fan housing—you’ll typically find 4-6 screws or bolts around the perimeter. Remove all fasteners completely and set them aside; do not reuse old fasteners as they may be corroded or damaged. Gently lift the entire vent assembly straight up and away from the roof opening, being careful not to tear the existing wiring harness. Once the unit clears the opening, disconnect the wire harness by depressing the connector tab or removing the terminal crimp connectors, then set the old fan aside.

Step 3: Clean and Prepare the Roof Opening

Use a plastic scraper or old credit card to remove all old Butyl Seal Tape and Dicor sealant residue from the roof flange area—this step is critical for proper sealing of your new unit. Wipe down the entire mounting surface with a lint-free cloth and rubbing alcohol to remove dust, debris, and any remaining sealant particles. Inspect the roof opening itself for any cracks, corrosion, or damage; minor surface rust can be lightly sanded and wiped clean, but structural damage requires repair before proceeding. Allow the area to air dry completely for at least 10 minutes before applying new sealing materials.

Step 4: Install Fresh Butyl Seal Tape

Unroll the Butyl Seal Tape and apply a continuous bead around the entire perimeter of the roof opening, pressing it firmly into place with your thumb—the tape should form a complete seal with no gaps or overlaps. Work in sections and maintain consistent pressure to ensure the tape bonds properly to the roof surface. The tape should sit approximately 1/2 inch inward from the outer edge of the opening to allow room for the vent flange to compress it evenly. Check your work by running your finger around the entire perimeter to confirm the seal is continuous and firmly adhered.

Step 5: Position and Secure the New Vent Fan

Carefully lower your new Maxxair 00-05100K (or Fan-Tastic Vent 806250) into position, aligning the mounting holes with the roof opening and ensuring the vent is oriented correctly—check your manual for proper direction, as some vents have exhaust orientation arrows. Insert all fasteners but do not tighten them fully; instead, hand-tighten each one in a criss-cross pattern (like tightening wheel lugs) to ensure even pressure across the flange. Once all fasteners are hand-tight, use your torque wrench to tighten each fastener to 8-12 inch-pounds in the same criss-cross pattern—over-torquing will compress the Butyl Seal Tape unevenly and cause leaks. Verify the vent sits flush against the roof with no gaps.

Step 6: Seal Flange and Connect Electrical Wiring

Apply a continuous bead of Dicor Lap Sealant around the entire perimeter of the vent flange where it meets the roof, slightly overlapping both the flange edge and the roof surface to create a weathertight seal. Use a wet caulking tool or gloved finger to smooth the sealant into a concave profile, which helps water shed away from the joint. Inside the RV, prepare your wire connections by stripping 1/4 inch of insulation from each conductor wire on both the vent harness and your RV’s power circuit. Use Wire Crimp Connectors and Heat Shrink Kit to join the positive (usually red) and negative (usually black) wires, crimping firmly and sliding heat shrink tubing over each connection before applying heat with a heat gun until the shrink tubing contracts fully.

Step 7: Test Fan Operation and Verify Sealing

Restore power at your RV’s electrical panel and switch on the vent fan, listening for normal motor operation and checking that air is being drawn out through the vent—the fan should run smoothly without unusual noise or vibration. If you installed a Vent Fan Remote Control Kit, test both the manual switch and remote operation to confirm both function properly. Visually inspect the roof seal from outside, checking for any gaps, cracks, or exposed Butyl Seal Tape around the flange perimeter. During your next rain, monitor the area below the vent from inside the RV for any water drips or moisture, and inspect the roof joint after the weather clears to confirm the Dicor sealant has cured fully and is weathertight.