Fel-Pro 35660 Engine Coolant Thermostat Seal

Fel-Pro 35660 Thermostat Seal Overview

Fel-Pro 35660 is an engine coolant thermostat seal built for applications that require a precise sealing surface at the thermostat housing. With premium-grade construction and application-specific materials, it supports reliable coolant sealing for vehicles such as Cadillac STS, Cadillac SRX, Cadillac XLR, Chrysler Sebring, Dodge Stratus, Chrysler Concorde, Chrysler Intrepid, and Dodge Intrepid.

Use Fel-Pro 35660 when you need a thermostat seal with the correct inside diameter and thickness for a proper fit. This part number is also referenced in OE-style replacement searches for 2001-2007 Chrysler Sebring thermostat seal and 2001-2006 Dodge Stratus thermostat seal applications.

Key Features

• Engine coolant thermostat seal for sealing the thermostat housing interface
• Premium grade type for demanding cooling system service
• Inside diameter: 1.890 in. / 48.0 mm
• Thickness: 0.245 in. / 6.2 mm
• Application-specific sealing material from Fel-Pro
• Part number: 35660

Detailed Description

Fel-Pro 35660 is engineered as a thermostat seal for cooling system service where accurate dimensions matter. The 1.890-inch inside diameter and 0.245-inch thickness help provide the sealing profile needed at the thermostat housing, while Fel-Pro’s application-specific material approach is aimed at consistent sealing performance in real-world repair conditions. This part number 35660 is used across multiple Chrysler, Dodge, and Cadillac applications, including Cadillac STS, Cadillac SRX, Cadillac XLR, Chrysler Sebring, and Dodge Stratus.

Fel-Pro gaskets are known for vehicle-specific sealing solutions, and this thermostat seal follows that approach for applications that demand a dependable coolant seal. If you are servicing a Chrysler Concorde, Chrysler Intrepid, or Dodge Intrepid cooling system, verify the housing design and dimensions against the listed specifications before installation.

What It Helps Address

• Coolant seepage at the thermostat housing
• Sealing issues after thermostat service
• Improper seal fit from worn or incorrect gasket dimensions
• Cooling system leaks traced to the thermostat interface
• Repeat repairs caused by degraded sealing material

Installation Notes and Tips

• Clean the thermostat housing and mating surfaces before installation.
• Confirm the inside diameter and thickness match the original seal requirements.
• Inspect the thermostat housing for corrosion, pitting, or distortion that could affect sealing.
• Use the correct coolant service procedure for the vehicle and refill system after installation.
• Verify fitment for the exact year and model, including Cadillac STS, Cadillac SRX, Cadillac XLR, Chrysler Sebring, and Dodge Stratus applications.

Quality Assurance

Fel-Pro positions this gasket and sealing system line around vehicle-specific materials and sealing performance trusted by professionals. Part number 35660 cross-references MAHLE C31640 and C32390 for the same application.