Fel-Pro 35678 Engine Coolant Thermostat Seal

Fel-Pro 35678 Engine Coolant Thermostat Seal

Fel-Pro 35678 is a premium engine coolant thermostat seal built for direct-fit sealing performance in cooling system service. It is made with application-specific materials to support a reliable seal where the thermostat housing meets the engine cooling circuit.

Key Features

• Premium-grade thermostat seal for cooling system sealing service
• Application-specific material selection for vehicle sealing accuracy
• 0.225 in. thickness / 5.7 mm thickness
• Mounting hole quantity: 0
• Fits Jeep TJ, Wrangler, and Liberty applications listed below
• Fel-Pro part number 35678 for easy identification

Product Details

Fel-Pro 35678 is an engine coolant thermostat seal engineered for sealing the thermostat interface in select Jeep cooling systems. The seal thickness is specified at 0.225 in. (5.7 mm), helping support proper compression and sealing at the thermostat housing. Fel-Pro’s sealing approach uses application-specific materials to deliver vehicle-focused fitment and durability for service work on Jeep TJ, Jeep Wrangler, and Jeep Liberty models. This part cross-references Monroe Shocks & Struts (e.g., 113831, 53010554AA) for the same application.

What It Helps Address

• Coolant seepage at the thermostat housing
• Sealing issues after thermostat service
• Loss of cooling system pressure at the thermostat interface
• Leak-related coolant odor or residue around the housing
• Repeat repairs caused by worn or compressed thermostat seals

Installation Notes and Tips

Clean the sealing surfaces thoroughly before installation and inspect the thermostat housing for corrosion, pitting, or distortion. Verify the seal seats evenly and matches the application-specific thermostat housing design before reassembly. For fitment reference, this part fits 2003 Jeep TJ, N/A; fits 2005-2006 Jeep TJ, N/A; fits 2003-2006 Jeep Wrangler, N/A; and fits 2002-2005 Jeep Liberty, N/A.

Quality Assurance

Fel-Pro gaskets are built around vehicle-specific sealing materials and professional-grade sealing standards for cooling system service. Part number 35678 is identified for the listed Jeep applications and supports accurate replacement selection for thermostat seal service.