Elring 658.490 Engine Coolant Thermostat Gasket

Elring 658.490 Thermostat Gasket

Elring 658.490 is an engine coolant thermostat gasket in O-ring form, built to seal the thermostat housing and help maintain a secure coolant path. With a 58.7 mm inside diameter, 53.9 mm outer diameter, and 2.6 mm thickness, it is sized for specific GM, Cadillac, Hummer, Saab, and Isuzu applications.

This thermostat gasket is a direct-fit sealing component for vehicles such as the Chevrolet Silverado 1500, GMC Sierra 1500, and Chevrolet Trailblazer. The Elring 658.490 part number is also referenced in thermostat service applications where precise O-ring dimensions matter.

Key Features

• Engine coolant thermostat gasket in O-ring shape
• Inside diameter: 58.7 mm
• Outer diameter: 53.9 mm
• Thickness: 2.6 mm
• Designed for thermostat housing sealing applications
• Cross-reference: Dayco 72141 and FEL-PRO 35632

Detailed Description

Elring 658.490 is a sealing gasket used at the thermostat housing to create a tight coolant seal between mating surfaces. Its O-ring profile and measured dimensions support accurate replacement on a wide range of vehicles, including Chevrolet Express 2500, GMC Yukon, and Cadillac Escalade applications. When replacing a thermostat or servicing the cooling system, using the correct gasket dimensions is critical for maintaining proper sealing performance.

Compatible vehicle coverage includes many 1997-2016 GM platforms, with fitment listed for Chevrolet Silverado 1500, Chevrolet Tahoe, GMC Sierra 2500 HD, GMC Savana 3500, Hummer H3, Saab 9-7x, and Isuzu Ascender models. The Elring 658.490 thermostat gasket is also listed for Chevrolet Corvette and Pontiac Firebird applications.

What It Helps Address

• Coolant seepage at the thermostat housing
• Leaks after thermostat replacement
• Improper sealing from worn or flattened O-rings
• Coolant loss around the engine coolant thermostat area
• Service issues caused by incorrect gasket dimensions

Installation Notes and Tips

Confirm the thermostat housing style and gasket dimensions before installation. Clean both sealing surfaces thoroughly, remove old gasket material or residue, and inspect the housing for pitting or warpage. Install the O-ring evenly to avoid twisting or pinching, then refill and bleed the cooling system according to the vehicle service procedure. For fitment verification, match the vehicle year, make, and model to the listed applications for Elring 658.490.

Quality Assurance

Elring is known for sealing-system components used in engine service applications. This part is identified by the Elring 658.490 part number and is cataloged with dimensional specifications to support accurate application matching.