Fel-Pro 35665 Engine Water Pump O-Ring

Fel-Pro Engine Water Pump O-Ring 35665

Fel-Pro 35665 is an engine water pump O-ring built for sealing applications where a precise fit matters. It uses application-specific materials to help maintain a dependable seal in cooling system service on select Saturn, Cadillac, and Saab vehicles.

Key Features

• Engine water pump O-ring for cooling system sealing
• Application-specific material selection for vehicle-specific fit
• Supports 100% vehicle sealing when installed on the correct application
• Fel-Pro part number 35665 for easy identification
• Cross-reference: MAHLE K31598 for the same application

Detailed Description

This Fel-Pro water pump O-ring is made for sealing the water pump interface on covered applications, helping maintain coolant containment at the pump connection. Fel-Pro 35665 is a direct-fit sealing component for select 1994-2005 Saturn, Cadillac, and Saab models, including Saturn L300, Saturn Vue, Cadillac CTS, and Saab 9-5. If you are servicing a cooling system leak on a Saturn L300 or Saab 900, this O-ring provides the sealing profile needed for the repair.

Fel-Pro gaskets and seals are engineered around vehicle-specific applications rather than one-size-fits-all sizing, which helps support consistent sealing performance in demanding engine cooling environments. This part number, 35665, is also referenced for related applications under MAHLE K31598.

Common Repair Uses

• Water pump seepage at the O-ring sealing surface
• Coolant leaks traced to the pump-to-engine interface
• Cooling system service on Saturn, Cadillac, or Saab vehicles
• Replacement of a hardened, flattened, or damaged pump seal
• Restoring a proper seal after water pump removal

Installation Notes and Tips

Clean the sealing surfaces thoroughly before installation and inspect the water pump groove or mating surface for corrosion, debris, or old seal material. Verify the replacement matches the original application by year, make, and model before assembly. For best results, install the O-ring on a clean, dry surface and follow the vehicle service procedure for the cooling system.

Quality Assurance

Fel-Pro is known for application-specific sealing solutions used by professional technicians. This part is built to support reliable sealing performance in the intended water pump application.

Compatible With

• Fits 2001-2005 Saturn L300, N/A
• Fits 2003-2004 Cadillac CTS, N/A
• Fits 1999-2003 Saab 9-5, N/A
• Fits 2001-2003 Saturn LW300, N/A
• Fits 2002-2003 Saturn Vue, N/A
• Fits 1997-2001 Cadillac Catera, N/A
• Fits 2000 Saturn LS2, N/A
• Fits 2000 Saturn LW2, N/A
• Fits 1994-1997 Saab 900, N/A
• Fits 1995-1997 Saab 9000, N/A