Fel-Pro 35741 Engine Coolant Thermostat O-Ring

Engine Coolant Thermostat O-Ring for Honda and Acura

Fel-Pro 35741 is an engine coolant thermostat O-ring built for sealing service on a wide range of Honda and Acura applications. With a 2.525-inch inside diameter and 0.220-inch thickness, it is sized for a precise thermostat seal in cooling system repairs.

Compatible with vehicles such as the Honda Civic, Honda CR-V, Honda Accord, Acura MDX, and Acura RDX, this Fel-Pro thermostat O-ring supports dependable coolant sealing across many late-model and earlier Honda/Acura platforms.

Key Features

• Part number: 35741
• Engine coolant thermostat O-ring for cooling system sealing
• Inside diameter: 2.525 in. / 64.1 mm
• Thickness: 0.220 in. / 5.5 mm
• Premium grade construction
• Application-specific sealing material for vehicle-specific fitment
• Mounting hole quantity: 0

Detailed Description

Fel-Pro 35741 is engineered as a thermostat O-ring seal for Honda and Acura cooling system service. Fel-Pro gaskets are built around application-specific materials to deliver full vehicle sealing performance, and this part follows that approach with dimensions matched to the thermostat housing interface. Use it when replacing a thermostat seal on vehicles including the Honda Civic, Honda Accord, Honda CR-V, Acura MDX, and Acura TLX. This part cross-references Genuine 19305RAAA01 for the same application.

What It Is Used For

• Replacing a worn or flattened thermostat O-ring
• Stopping coolant seepage at the thermostat housing
• Restoring a proper seal after thermostat service
• Addressing coolant odor or visible residue around the housing
• Supporting leak repair on Honda and Acura cooling systems

Installation Notes and Tips

Inspect the thermostat housing and sealing surface before installation. Clean away old gasket material, coolant residue, and corrosion so the O-ring seats evenly. Verify the part dimensions against the original seal and confirm the application by year, make, and model before assembly. Refill and bleed the cooling system according to the vehicle service procedure after installation.

Quality Assurance

Fel-Pro positions this gasket and sealing product line around vehicle-specific materials and professional-grade sealing performance. The premium grade designation and application-focused design support consistent fitment for cooling system repair work.