Fel-Pro 25589 Engine Coolant Thermostat O-Ring

Fel-Pro 25589 Engine Coolant Thermostat O-Ring

Fel-Pro 25589 is a premium engine coolant thermostat O-ring built for direct sealing performance in a wide range of import and domestic applications. It uses application-specific sealing materials to deliver the 100% vehicle sealing Fel-Pro is known for, with fitment coverage for Audi, BMW, Volkswagen, and Lincoln models.

Key Features

• Premium-grade thermostat O-ring for engine cooling system service
• Application-specific material selection for reliable sealing performance
• Engine coolant thermostat O-ring, part number 25589
• Direct fit coverage for many Audi A4, A6, S4, and Volkswagen Jetta applications
• Also compatible with select BMW 325i, 528i, and Z3 thermostat housing applications
• Cross-reference part numbers include 87072S91 and 112591

Detailed Description

Fel-Pro 25589 is an engine coolant thermostat O-ring designed for vehicles that use a 60 mm inside diameter sealing surface or an aluminum thermostat housing with a 60 mm inside diameter. This part number 25589 is listed across numerous Audi, BMW, Volkswagen, and Lincoln applications, including Audi A4, A6 Quattro, S4, and Volkswagen Golf, Jetta, Passat, and EuroVan models. Fel-Pro’s sealing materials are selected for application-specific use, helping maintain a dependable coolant seal at the thermostat housing.

This part cross-references 87072S91 and 112591 for the same application.

Vehicle Fitment

• Fits 2001-2005 Audi Allroad Quattro, N/A, 60 mm inside diameter.
• Fits 1995-2005 Volkswagen Golf, N/A, 60 mm inside diameter.
• Fits 1993-2005 Volkswagen Passat, N/A, 60 mm inside diameter.
• Fits 1998-2004 Audi A6 Quattro, N/A, 60 mm inside diameter.
• Fits 1994-2004 Volkswagen Jetta, N/A, 60 mm inside diameter.
• Fits 1999-2003 Volkswagen EuroVan, N/A, 60 mm inside diameter.
• Fits 1997 Volkswagen EuroVan, N/A, 60 mm inside diameter.
• Fits 2000-2002 Audi S4, N/A, 60 mm inside diameter.
• Fits 1992-1994 Audi S4, N/A, 60 mm inside diameter.
• Fits 1997-2001 Audi A4, N/A, 60 mm inside diameter.
• Fits 1998-2001 Audi A4 Quattro, N/A, 60 mm inside diameter.
• Fits 1998-2001 Audi A6, N/A, 60 mm inside diameter.
• Fits 2000 BMW 323Ci, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1998-2000 BMW 323i, N/A, aluminum housing with 60 mm inside diameter.
• Fits 2000 BMW 328Ci, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1996-2000 BMW 328i, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1997-2000 BMW 528i, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1997-2000 BMW Z3, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1998-1999 BMW 323is, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1996-1999 BMW 328is, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1995-1997 Audi S6, N/A, 60 mm inside diameter.
• Fits 1992-1995 BMW 320i, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1992-1995 BMW 325i, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1992-1995 BMW 325is, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1991-1995 BMW 525i, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1992-1995 Volkswagen Corrado, N/A, 60 mm inside diameter.
• Fits 1987-1993 BMW 325i, N/A, 60 mm inside diameter.
• Fits 1993 BMW 525iT, N/A, aluminum housing with 60 mm inside diameter.
• Fits 1991-1992 Audi 80, N/A, 60 mm inside diameter.
• Fits 1988-1992 Audi 80 Quattro, N/A, 60 mm inside diameter.
• Fits 1988-1992 Audi 90 Quattro, N/A, 60 mm inside diameter.
• Fits 1989-1991 Audi 100, N/A, 60 mm inside diameter.
• Fits 1989-1991 Audi 100 Quattro, N/A, 60 mm inside diameter.
• Fits 1989-1991 Audi 200, N/A, 60 mm inside diameter.
• Fits 1989-1991 Audi 200 Quattro, N/A, 60 mm inside diameter.
• Fits 1988-1991 Audi 90, N/A, 60 mm inside diameter.
• Fits 1990-1991 Audi Coupe Quattro, N/A, 60 mm inside diameter.
• Fits 1987-1991 BMW 325is, N/A, 60 mm inside diameter.
• Fits 1988-1991 BMW 325iX, N/A, 60 mm inside diameter.
• Fits 1989-1990 BMW 525i, N/A, 60 mm inside diameter.
• Fits 1986-1988 Audi 5000 Quattro, N/A, 60 mm inside diameter.
• Fits 1982-1988 BMW 528e, N/A, 60 mm inside diameter.
• Fits 1983-1988 Volkswagen Quantum, N/A, 60 mm inside diameter.
• Fits 1984-1987 Audi 4000 Quattro, N/A, 60 mm inside diameter.
• Fits 1981-1987 Audi Coupe, N/A, 60 mm inside diameter.
• Fits 1984-1987 BMW 325e, N/A, 60 mm inside diameter.
• Fits 1986-1987 BMW 325es, N/A, 60 mm inside diameter.
• Fits 1980-1986 Audi 4000, N/A, 60 mm inside diameter.
• Fits 1983-1986 Audi Quattro, N/A, 60 mm inside diameter.
• Fits 1985-1986 BMW 524td, N/A, 60 mm inside diameter.
• Fits 1984-1985 Lincoln Continental, N/A, 60 mm inside diameter.
• Fits 1984-1985 Lincoln Mark VII, N/A, 60 mm inside diameter.

Installation Notes and Tips

• Confirm the thermostat housing style and inside diameter before installation.
• Inspect the sealing groove and mating surfaces for corrosion, coolant residue, or debris.
• Replace the O-ring during thermostat service to restore a proper coolant seal.
• Use the vehicle’s specified coolant and follow the manufacturer bleed procedure after service.

Quality Assurance

Fel-Pro gaskets and sealing components are built around application-specific materials and sealing standards used by professional technicians. Part number 25589 is engineered as a premium thermostat O-ring for dependable cooling system sealing across the listed Audi, BMW, Volkswagen, and Lincoln applications.