Fel-Pro 35631 Engine Coolant Thermostat Seal

Fel-Pro 35631 Engine Coolant Thermostat Seal

Fel-Pro 35631 is a premium engine coolant thermostat seal built for precise sealing at the thermostat housing. It is made for applications that use a 1.605 in. (40.7 mm) inside diameter and 0.090 in. (2.2 mm) thickness, with a 2-hole mounting pattern for the specified housing design.

Compatible With Chrysler 300, Dodge Charger, and related Chrysler, Dodge, and Plymouth applications that call for this seal, Fel-Pro 35631 supports a clean coolant seal in cast aluminum housing setups where listed.

Key Features

• Engine coolant thermostat seal for cooling system service
• Inside diameter: 1.605 in. / 40.7 mm
• Thickness: 0.090 in. / 2.2 mm
• Premium grade type
• 2 mounting holes for the specified housing design
• Application-specific sealing material for vehicle-specific fitment

Detailed Description

Fel-Pro 35631 is engineered as a thermostat seal for vehicles that require a precise coolant-side seal at the thermostat housing. Fel-Pro gaskets are built around application-specific materials to deliver vehicle sealing performance professionals rely on, and this part follows that approach with dimensions matched to the listed applications. This part cross-references MAHLE C31981 for the same application.

Fits 2007-2010 Chrysler 300, N/A; Fits 2005-2006 Chrysler 300, N/A; Fits 2007-2010 Dodge Charger, N/A; Fits 2006 Dodge Charger, N/A; Fits 2007-2008 Dodge Magnum, cast aluminum housing; Fits 2005-2006 Dodge Magnum, N/A; Fits 2009-2010 Dodge Challenger, cast aluminum housing; Fits 2009-2010 Dodge Avenger, cast aluminum housing; Fits 2008 Dodge Avenger, N/A; Fits 2009-2010 Dodge Journey, N/A; Fits 2009-2010 Chrysler Sebring, cast aluminum housing; Fits 2007-2008 Chrysler Sebring, N/A; Fits 2004-2008 Chrysler Pacifica, N/A; Fits 1999-2004 Chrysler 300M, N/A; Fits 1998-2004 Chrysler Concorde, N/A; Fits 1998-2004 Chrysler Intrepid, N/A; Fits 1998-2004 Dodge Intrepid, N/A; Fits 2001-2002 Chrysler Prowler, N/A; Fits 1999-2001 Chrysler LHS, N/A; Fits 1999-2001 Plymouth Prowler, N/A.

What It Helps Address

• Coolant seepage at the thermostat housing
• Seal deterioration from heat cycling
• Improper sealing after thermostat service
• Leak paths caused by worn or flattened gasket material
• Fitment issues on specified cast aluminum housing applications

Installation Notes and Tips

Verify the thermostat housing style and match the seal dimensions before installation. Clean the sealing surfaces thoroughly, remove old gasket material, and inspect the housing for warpage or corrosion. Use the correct coolant service procedure for the vehicle and confirm the seal seats evenly in the housing before reassembly.

Quality Assurance

Fel-Pro focuses on application-specific sealing solutions for vehicle repair, with materials selected for the demands of cooling system service. The 35631 thermostat seal is a premium-grade sealing component for the listed Chrysler, Dodge, and Plymouth applications.