Ford F-350 Super Duty water accumulation in passenger side front floor boards, unresolved despite extensive dealer attempts on Ford F-350 Super Duty

Some Ford F-350 Super Duty owners report experiencing water accumulation in the passenger side front floorboards, despite attempts by dealers to resolve the issue. Common causes of this problem include a plugged AC condensate drain line, leaking heater core, windshield seal, or sunroof drains, as well as water ingestion from the fresh air intake. To address these issues, owners are advised to inspect and seal any potential leaks in the vehicle's seals and weatherstripping, check for water accumulation under the passenger side sill plate, and ensure that drain tubes, particularly the rear firewall vent on the passenger side, are clear. Additionally, some owners find it helpful to clear any debris from a 4"-long rubber hose hanging down on the passenger side of the firewall to facilitate proper drainage. Implementing these solutions may help effectively resolve the water accumulation issue.