Mahle C31227 Engine Coolant Thermostat Housing Gasket

Engine Coolant Thermostat Housing Gasket for OE Fit

Mahle C31227 is an OEM-standard engine coolant thermostat housing gasket made from molded rubber for a precise seal at the thermostat housing. It is built for direct replacement service on a wide range of GM vehicles, including Buick LeSabre, Pontiac Grand Prix, and Chevrolet Impala applications.

Key Features

• Molded rubber gasket material for a formed sealing surface
• OEM Standard item grade for factory-style replacement fit
• Designed for engine coolant thermostat housing sealing service
• Mahle sealing product backed by OE-focused manufacturing standards
• Cross-references FEL-PRO 35666 and General Motors 25535126 for the same application

Detailed Description

This Mahle thermostat housing gasket helps restore a secure seal between the thermostat housing and engine cooling components. The molded rubber construction supports consistent compression and sealing performance in cooling system service, making it a practical choice for vehicles that need a direct-fit replacement. Part number C31227 is listed across many GM platforms, including Pontiac Grand Prix, Buick Park Avenue, and Chevrolet Monte Carlo models, as well as other Buick, Chevrolet, Oldsmobile, and Pontiac applications from 1989-2007.

Compatible With 1997-2007 Pontiac Grand Prix, N/A; 1991-2005 Buick Park Avenue, N/A; 2000-2005 Chevrolet Impala, N/A; and additional listed GM applications. Use C31227 when replacing a thermostat housing gasket on supported vehicles where molded rubber sealing is specified.

What It Is Used For

• Stopping coolant seepage at the thermostat housing
• Replacing a flattened, hardened, or damaged housing gasket
• Restoring a proper seal after thermostat service
• Addressing coolant odor or visible residue around the housing
• Supporting cooling system maintenance on GM passenger cars and light trucks

Installation Notes and Tips

Clean both sealing surfaces thoroughly before installation and remove all old gasket material, corrosion, and coolant residue. Verify the housing and mating surfaces are flat and undamaged, then install the gasket in the correct orientation for the application. Refill and bleed the cooling system according to the vehicle service procedure after installation.

Quality Assurance

Mahle gaskets are engineered as OE-standard sealing components and are trusted by OEMs and technicians worldwide for cooling system sealing service.