Fel-Pro 35808 Engine Coolant Thermostat Housing O-Ring

Fel-Pro 35808 Thermostat Housing O-Ring

Fel-Pro 35808 is a premium engine coolant thermostat housing O-ring built for sealing performance on select Ford Super Duty and E-Series applications. It uses application-specific materials to deliver dependable sealing where the thermostat housing meets the cooling system.

Key Features

• Premium-grade thermostat housing O-ring for cooling system sealing
• Application-specific material selection for a precise seal
• Supports 100% vehicle sealing at the thermostat housing interface
• Direct-fit replacement for select Ford trucks and vans
• Cross-references MAHLE C31801 and Ford 3C3Z8255AA for the same application

Detailed Description

Fel-Pro 35808 is an engine coolant thermostat housing O-ring for vehicles that need a reliable seal at the thermostat housing. Fel-Pro gaskets are known for using materials matched to the application, helping maintain cooling system integrity under everyday driving and service conditions. This part number is used on select Ford E-350 Super Duty, F-250 Super Duty, F-350 Super Duty, E-350 Club Wagon, and Excursion models, making it a practical choice for Ford cooling system repairs.

Fits 2004-2010 Ford E-350 Super Duty, N/A. Fits 2003-2007 Ford F-250 Super Duty, N/A. Fits 2003-2007 Ford F-350 Super Duty, N/A. Fits 2004-2005 Ford E-350 Club Wagon, N/A. Fits 2003-2005 Ford Excursion, N/A.

Common Uses

• Replacing a leaking thermostat housing seal
• Restoring cooling system sealing after thermostat service
• Addressing coolant seepage at the housing joint
• Repairing worn or flattened O-ring sealing surfaces
• Supporting maintenance on Ford Super Duty and E-Series cooling systems

Installation Notes and Tips

Inspect the thermostat housing and mating surfaces before installation. Clean away old coolant residue, corrosion, and debris so the new O-ring seats evenly. Verify the part number against the vehicle application before service, especially on Ford E-350 Super Duty, F-250 Super Duty, and F-350 Super Duty models.

Quality Assurance

Fel-Pro focuses on sealing solutions built with application-specific materials and premium-grade construction for professional repair use. Fel-Pro 35808 is made to support dependable cooling system sealing on the listed Ford applications.