Mahle C31979 Engine Coolant Thermostat Housing Gasket

Engine Coolant Thermostat Housing Gasket for OE Fit

Mahle C31979 is an OEM-standard engine coolant thermostat housing gasket made from molded rubber for a precise sealing surface. It is built for vehicles that need a reliable thermostat seal to maintain proper coolant control and reduce leakage at the housing.

Compatible with select Buick, Chevrolet, Pontiac, and General Motors applications, including Buick Allure, LaCrosse, Lucerne, LeSabre, Park Avenue, Regal, Chevrolet Impala, Monte Carlo, Pontiac Bonneville, Grand Prix, and Buick Lucerne models listed below. This Mahle C31979 gasket is a direct-fit sealing component for thermostat housing service.

Key Features

• Molded rubber gasket material for consistent sealing performance
• OEM Standard item grade for factory-style fit and function
• Engine coolant thermostat housing gasket for cooling system service
• Mahle sealing product engineered for technician and OE-level use
• Cross-references FEL-PRO 35666 and General Motors 24506985 for the same application

Detailed Product Overview

Mahle C31979 is designed for thermostat housing sealing where coolant temperature control depends on a secure, leak-resistant joint. The molded rubber construction helps the gasket conform to the housing surface, supporting a clean seal during thermostat service on GM platforms such as Buick Allure, Buick LaCrosse, Chevrolet Impala, and Pontiac Grand Prix. As an OEM-standard replacement, it follows the fit and sealing expectations commonly required in cooling system repairs.

Vehicle Fitment

• Fits 2005-2009 Buick Allure, N/A
• Fits 2005-2009 Buick LaCrosse, N/A
• Fits 2006-2008 Buick Lucerne, N/A
• Fits 2004-2008 Pontiac Grand Prix, N/A
• Fits 2004-2005 Buick LeSabre, N/A
• Fits 2004-2005 Buick Park Avenue, N/A
• Fits 2004-2005 Chevrolet Impala, N/A
• Fits 2004-2005 Chevrolet Monte Carlo, N/A
• Fits 2004-2005 Pontiac Bonneville, N/A
• Fits 2004 Buick Regal, N/A

Common Repair Uses

• Thermostat housing coolant seepage
• Coolant leaks at the thermostat seal area
• Maintenance during thermostat replacement
• Sealing issues after housing removal and reassembly
• Restoring a proper seal on GM cooling system service

Installation Notes and Tips

Clean the thermostat housing and mating surfaces before installation. Inspect the housing for corrosion, warping, or old seal residue, and verify the replacement gasket matches the original profile before assembly. For optimal performance during installation of Engine Coolant Thermostat Seal, use the included gasket from the set.

Quality Assurance

Mahle gaskets are known for OE-level sealing standards and are trusted by technicians and vehicle manufacturers worldwide. C31979 is built to meet OEM-standard expectations for fit and sealing performance in cooling system repair.